^^^^^ what Viking499 said.
Congrats, you have a somewhat of an oddity. As was stated, the 75D is both the P01, and PCR. Typically your slide would have gone on a non rail aluminum frame. I've also seen them the other way around, the (75D) P01 slide (no shelf on the rear sight) on the non rail frame. I think it's cool, I like oddities. [emoji16][emoji87]