PSAK GF5E & RS Regulate

Looking to pick up a RS Regulate optic mount for a GF5E. Little confused on which model of lower mount to go with (301m, 302m,303m, etc). Which mount would fit a late model Soviet Arms/PSAK GF5E? Isn’t the mount used a Bulgarian style optic mount? HALP

Take a look at this thread:

Also this one on here:

And this one:

Seems the 302 or 303 from what i am reading. The difference is the dimensions of the mount (not the clamping part, which is identical).

Thanks for the leads bud