Receiver is D&T... for what?

[lone-wolf]

I got a ~1950s .22 that is D&T on the side. I have two holes at the very rear of the receiver that are spaced ~0.9" hole to hole. Looks like a rear peep sight, but what ones fit?
It's a Savage 4c.

 

[Winnipeg Toymaker]

Peeps were installed on many different guns. Mossberg, Stevens, Marlin for example. The two at the action rear may fit the Mossberg peeps, but several manufacturers made peeps and even Winchester used many different sights made by Marble and Williams.