This is the fuel pump that I using to replace my stock pump:
https://www.oreillyauto.com/detail/b...992/subaru/svx
I would imagine there would be a bunch a generic pumps would should work.
When they say it doesn't fit, what do they mean?
This job was a major pain in the ass, and ultimately my problem turned out to be something different (bad MAF connector).
Good luck!
Ian.