Question Amiga 3000 ( Commodore)

Dec 5, 2021
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I am trying to get my1990's Amiga going. The PSU has failed and no longer produced. I have ordered an adaptor cable to fit an ATX type. but I cannot see one to fit the case. Original 4.5" wide 7" long 2.5 high switch front fan rear. It does not need a on/off as the adaptor cable has one.
I'd be grateful for your ideas or if anybody has done this conversion before.
I'm worried I'll have to get the local electronic genius to fix the one it came with.