Need a Source For a Receiver Peep Sight For Rossi Model 62

[albayo]

I have a friend with a mint Rossi Model 62 AS and need a receiver Peep sight for it. The eyes aren't as good as they used to be. Its drilled and tapped for one but I can't seem to find any leads on receiver peep sights, except tang sights.

Any help would be greatly appreciated.

Thanks