Quite a few options for you. Probably most common is the two-position safety that swings like the original, but only on one side, down, and semi-up, so it clears a scope. Several folks make them. Then there are the aftermarket triggers that include a safety, which is a thumb-piece inletted into right side of stock, alongside cocking piece. Then there are the ones that are like the Win. Model 70, that fit into the cocking piece. They are available in two position ( most economical ), and three position. Brownells sells quite a few types. Ed LaPour in Bremerton, Wa. offers the last type I mentioned, he advertises in "rifle". As someone mentioned, if a gunshop or gunsmith doesn't know, stay away from them.
Mark