Question on FPU for A1200 expansion board

[Miloo]

It uses a standard PLCC fpu, I got one a few weeks ago on ebay for £9.
The fpu just pushes into the PLCC spcket.

[Miloo]

You can use any speed 68881/68882 PLCC chip, I have a 25Mhz PLCC fpu socketed on my 1200 motherboard and it runs just fine.
It doesn't run at 25Mhz I think it runs at the same speed at the cpu. It depends what speed crystal you have.
They can only be inserted one way as one of the corners is squared off.