Ballard Rifle Company makes diect replacements. I looked at a rear sight today and it looks just like the ones on my 93's. They also make a silver bladed rocky moutain front. I haven't seen any at the gunshows for while. I bought a cut down trapdoor that had a set of front and rear Marlin or Winchester lever sights 3 months ago. moodyholler
I have seen old marlins with a number of sight combinations, which weren't original to the guns, but were period sights.
Marbles buckhorn rears, Lyman or Sheard front blades. Lyman or Marbles tang sights. Lyman combination front sights. Lyman globe front sights. I've even seen a few with Winchester type Express sights.
My factory engraved 1893 has a Fischer rear sight, and I'm still looking for any info I can get on this sight maker. Anybody heard of them, or have info?