Cooling water cooling an evga 7800gtx 256mb

does anyone know of a waterblock for cooling the reverse side of a evga 7800gtx. i have the gpu block and a swifttech ramcool for the front side of the card but it looks like evga went a little off the referance design and put memory on the reverse side of the card as well. i am currently trying to make a custom block to fit on the reverse side based on the mcaram cool but its not going so well.