He's talking about recapping an Astec PSU for a Mac II. I assume the Mac IIFx PSU is identical: these have a fan inside so there should be no problem.

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I have a Mac IIfx PSU as well and they're pretty much identical on the outside, but I think they're slightly different inside, but I don't recall what that difference is.

I've taken a pic to show the capacitors I intend on replacing and they are fairly tightly grouped together.

Am I safe on getting the one I specified earlier or should I continue searching for one of the same dimensions?

Cheers!

PS Those PSU's are a right royal PITA to work on, I still haven't figured out yet how to get the whole board out!