Gun broker would be the best choice for value. As far as what hand it is, it doesn't matter. You still have to reach over either way to engage and disengage the safety. It's not the best location for a safety. Look up Rem 760 serial number dates and see how many were produced.
No idea why you're reaching over? Unless you're a lefty shooting a right hand gun or vice versa
Sorry not reach over, but use your thumb to reach down. It's just awkward, and you have to loosen your grip quite a bit, unlike engaging it.
