** Alternative to using plexi glass would be to use the extra back plate that came with your CPU as a hold down for the Prommy. It requires cutting an opening for the vacuum hose in the bracket and drilling out the treaded openings.
Thanks go out to Boogotop at Xtreme forums for this pictureRadeon 9800 Pro + VapoChill
Here is a similar design that I made for the VapoChill to mount on Radeon video cards. I used a back plate to distribute pressure with 1/4" closed cell foam sandwiched between it and the card to prevent condensation. The Prommy head seals on the front of the Radeon if you leave the spacer around the core in place.Template for Radeon 9800 + VapoChill