Since I will be doing my own oil changes on our new GTR, I needed to source an oil filter wrench. I did a quick and dirty measurement of the OEM filter with a ruler, and came up with 67mm diameter from flat to flat. I ordered a cup wrench that was for filters 65-67mm with 14 flats...no luck, it was just a little too small. I measured the filter with calipers and found it to be 67.5mm. I found a Steelman 06109 68mm cup wrench on Amazon that fits for $8.99.