Simpson need pump help

I’m hoping someone here can help me with some info on a washer I just bought. I’ve been in contact with Simpson and FNA group as well as a few online parts sellers but apparently this washer is no longer supported. I picked it up at an estate auction and it’s in really good shape but the pump was allowed to freeze and damage some seals. Then it was run which then damaged a piston. If I could locate a new or good used piston and a seal kit I believe I can save it.
So, does anyone know of a parts source or possibly have a parts pump laying around ? The washer is a Simpson SW3000 ser# 850567 and the pump is a AAA HP3530B-S ser# 400466. It has a Wisconsin motor and uses a belt drive.

Thanks for any help with this.