Hope to get some help. I need to get a replacement rear sight for a Marlin 99 M-1. My Dad bought it new in the late '60s-early '70s. Somewhere along the way the rear folding sight broke and we removed it...and lost what was left of it! I'd like to find a complete replacement sight for it. Does anyone know of a good source for old Marlin parts? Numrich (eGunParts) doesn't seem to have all the pieces.