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Yeah, I wouldn't trust ANYTHING on Ebay anymore.

To answer your question: Yes, 7443 will work, but stay with 7443, since it's a dual-filament bulb (parking light and turn signal), unlike the 7440, which is single-filament.

The only other thing is: watch the height of the bulb, since I've discovered that the bulb is mounted with the base down within the headlight cluster (toward the ground), not with the base horizontally (toward the rear of the car). Not only does this limit the bulb height you can use, but it can also affect the light output, since not all the LEDs can use the reflector.

EDIT: If you want a discount code for V-leds, LMK.
 

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I've had pretty good luck with LED's from Ebay, but I only get them from a couple of people on there that sells good stuff. A 7443 can work as an 7440. If you need to, you can clip off the 2 wires on the bulb to make it fit if it doesn't already. V-Led's sells that exact same LED's that some EBay sellers sell, but at a much higher price.
 

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So I'm not alone here :). I also found that ushd and warden_jp2008 have one of the brightest LEDs. I bought
these for my tail blinkers and I'm waiting for the resistors to arrive to install them. The preliminary test prove they are as bright as the stock filament bulb.
 

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Supposedly those are the brightest. I hope u bought the 7440/7443....not the 3156/3157
 

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Check measurements. Height, length, width....all in millimeters
 

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Well, I ended up buying the ones I listed and they are super bright, but they just barely don't fit (too tall). Anyone point me to the ones they bought and know will fit/work in 2009/10 mazda 6?
I'm only replacing the tail blinkers for now. As you might have already noticed the front ones are installed vertically (not very good idea, is it?) with verry little space to go length wise on the new bulb. Almost all that I've seen out there are at least 50mm. The ones from superbrightleds dot com are 37mm - so those might be the same length as the filament ones, but I don't know if they are bright enough.
 

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I thought I would share this here as I find it very interesting and somehow mysterious. I thought I could save someone else time installing the resistors for the LED turn signals. Now, I have quite experience in electronics and I had to spend 2 hours fiddling this. Before splicing the wires I connected the 10 Ohm resistor to the connectors where the bulb is sitting, just to make sure it will be enough not to trigger the hyper flash. Good - It was enough. So I've spliced the 2 wires that go to the bulb socket, installed the resistor and ... Oh no - hyperflash !!! What??? The resistor of course is not getting warm too. I started measuring voltages, resistance, connectivity - all seemed weird. For example: the resistance b/w the two contacts of the bulb socket was zero Ohm??? What I ended up is finding out which of the two wires had the 12V compared to ground when active. Then just connected the resistor between this wire and the ground (metal chasis) - voila - working now.
 

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I thought I would share this here as I find it very interesting and somehow mysterious. I thought I could save someone else time installing the resistors for the LED turn signals. Now, I have quite experience in electronics and I had to spend 2 hours fiddling this. Before splicing the wires I connected the 10 Ohm resistor to the connectors where the bulb is sitting, just to make sure it will be enough not to trigger the hyper flash. Good - It was enough. So I've spliced the 2 wires that go to the bulb socket, installed the resistor and ... Oh no - hyperflash !!! What??? The resistor of course is not getting warm too. I started measuring voltages, resistance, connectivity - all seemed weird. For example: the resistance b/w the two contacts of the bulb socket was zero Ohm??? What I ended up is finding out which of the two wires had the 12V compared to ground when active. Then just connected the resistor between this wire and the ground (metal chasis) - voila - working now.
Do you have pics of final assembly?
 

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These leds listed below ended up working for me. I'd say they are as bright as stock, but I was hoping for brighter. Oh well, least they are LEDs.

2 AMBER 7443 V-LEDS M-SMT 27 LED TURN SIGNAL BULBS 7440
Good to know. I was initially thinking of just skipping the front turn signals, due to the fact that they're installed vertically, but if they're just as bright as OEM, I may reconsider getting them.

V-Leds has a newer 7443 that's supposed to be super-bright, but it also looks to be too long (tall) for the housing.

Any chance you have pics of them?
 

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@smarq9000:

No, sorry - I was time constrained and did not think of taking any photos of the actual wiring and attaching the resistor to the body. I might take some of how the turn signals are operating now ... I mean short movie probably would be the best ...
 
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