Unforunately, I don't think there's anything that will fit both a geforce2 and a modern era card. With radeon 8500s around for $35, it may be cheaper just to upgrade. Wow! My GTS did the same thing a ...
I've never replaced the thermal paste on my graphics card, which is shocking because I've done just about everything else you can do with PC hardware, and broken plenty of components in the process.