Fuel pump parts?

I'm having issues with my 14 yz450 and I think I have narrroed it down to the fuel pressure regulator. It's looking like I will have to buy the entire pump assembly to get a new regulator but I thought I would see if anyone on here knows where I could buy just the regulator? any help would be appreciated.

What was the bike doing leading up to needing a new fuel pump?

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