a tranny/engine oil cooler that is 11"W x 5"H x .75"D (model# 70255). Their website is [ www.bmracing.com. ] Look at the 'supercoolers.' I just had one installed, and it looks pretty well constructed, comes with all the hookup and mounting hardware, etc. I picked up a model# 70264 which is a little taller and 1.5" deep for $55 at a local speed shop.