Chances are very high your rifle was drilled and tapped after it left the factory. If you could post a pic of the top tang along with the top and left side of the receiver it will be much easier to provide the information you seek.

Erin

Richard,

Those holes were drilled after your rifle left the factory. They are 8-40 screws that hold the side plate on the side of the receiver. A side mount receiver sight uses 6-48 screws and the holes in the side are too large and are not positioned correctly for a receiver sight. Your tang is not drilled and tapped for a tang sight.  I believe I do have the proper scope mount for your rifle that would utilize the existing screw holes if you are interested.

Erin

Richard,

I just dug it out and I am sorry to say that the one I have is for mounting on the side of the barrel (Weaver N2).  Weaver made the one you are seeking to utilize your existing screw holes, I believe the part number for the one you are seeking is a N1. Weaver discontinued those mounts several years ago, chances of finding a new one are slim but used ones are commonly sold on Ebay  WEAVER N1 SIDE MOUNT / RINGS FOR 3/4″ TUBE RIFLE SCOPE COMPLETE | eBay Be advised these mounts use 3/4″ dia. scopes.  The Weaver B4, C3 and  “baby Redfield” come to mind. These scopes have all been out of production for several years but they are readily available on Ebay or Gunbroker. I would expect to pay $30-50 for one of the old Weavers and the Redfield will run you about $200

Erin

Richard,

I will send pics and pricing to your inbox some time today.

Erin