Anyone know which scope fits on these bases (bases on a Remington 742)

The old external adjustment Bausch & Lombs.

They were called Balscope and Balvar among other models. You can still find them on Ebay from time to time.

Thanks for the info.

Here are more examples and parts (just in case anyone is looking)

quote:

Originally posted by nsaqam:
The old external adjustment Bausch & Lombs.

You need the "spring" type ring set. not the plunger type.