I'd start with Numrich Gun Parts, if nothing else a good source for schematics.
I looked for a replacement rear sight for my 552 for two years before Numrich listed some reproductions.
eBay & other action sites like Hibid is also a good source for parts especially small screws but again, patience.
Be flexible, Remington made more than one tube fed magazine model, so don't just focus on a 552 when a 512 MIGHT work. It's a gamble, but most manufacturers kept it simple and used the same parts in different models, even though most schematics don't show it.
I just got a Marlin 80 running, after buying a replacement striker assembly from Numrich I was still missing the one screw that holds it in place, and Numrich didn't have it. Closest I found was a screw on eBay for a Marlin 59/60 bolt action shotgun but looking at schematics on Numrich for both models, it looked like they both did the same thing. It worked.
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