That's not bad either, but if I were you i would stick to the B&M. The installation writeup uses this cooler, and the mounting is easy attaching it to the hood bolts.This is one that Advance auto offers will it work.
Maxi-Cool XL Transmission Oil Cooler by Imperial - Part 243007 - Advance Auto Parts
Can you post a picture of it installed?This is the ATX cooler I have on my 6. Easy installation, and seems to work fine.
B&M 70264 - B&M SuperCooler Oil Coolers - Overview - SummitRacing.com