If you got only 8 Mb RAM in your IIfx, maybe I can help. I have got 4 64-pin 4 Mb SIMMs, which I do not use, because my IIfx has got already 8 64-pin 4 Mb SIMMs. I have tried to sell it here in Holland via a local auction site, but there was no responce.
There is a little problem with these SIMMs. I have also got 4 64-pin 1 Mb SIMMs. But they do not work together. After placement of the SIMMs (totally it would be 20 Mb RAM), I've got a black sad-mac-screen with a code (i dont know which one, but i can figer it out). But the 4 Mb SIMMs alone works fine.
Let me know if you want them. I can also sent photo's of the SIMMs.
Regards,
Emiel