I found one in the local auto parts store just like it. It was in the section with all the chrome parts for the V-8's. I forget who the manufacturer was though.
I just replaced mine a few months ago. Just went to auto parts store and they had a suitable replacement pump listed in their database. cost like $50 though.
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74 wankel panther 77 REPU
79 rx7
89 Vert