Rossi Rifleman

Go with a tang Marbles sight.
If you are running a round barrel you'll need to drill and tap the second hole in the tang but it really is the best option.

I think ALL of the receiver peep sights 'hang off the side' even the old school versions if you can find them.

https://www.lymanproducts.com/lyman-66- ... ep-sights/
The Lyman 66 is pretty similar to the Williams, maybe with better adjustment detents but I'm not at all certain about that.

IMHO, if you want a sight that fits in the bolt's safety hole, you will be hard pressed to get something better than those made by a member of this site, vtoran. Since he makes his asjustable sites one at a time, he can ensure it will fit your bolt. I would not be surprised if he can also help with your lost pin.

Here are some pictures stolen from https://www.rossi-rifleman.com/viewtopic.php?f=9&t=2566


For frame mounted sights, I second Archer's suggestion for tang sights.

I have Marble's tang sights on both my Rossi 92. My 77 yo eyes like them just fine.

Make smoke,