I used the one that came with that Williams Firesight set, but it had to be filed down a little to fit. I didn’t see that set listed on their site, but a call to them might get you one. Otherwise, you might have to whittle some brass stock to fit.
I just got done sighting in an early Deluxe Deerslayer, the one that came with a factory-mounted Williams receiver sight. With nothing else on hand, I used the original orange triangle. Ithaca also had a black triangle that came with some models, but I haven’t seen one since the ‘60s or early ‘70s.
That rib on the Deerslayer barrel is just begging to be drilled and tapped for a base for a red dot, or the dovetail base Skinner sells.
EDIT: They make a bunch of
Firesights for pistols with narrow bases. One of those might be relatively easy to fit, but again, a call to Williams for their help would be a good place to start.
If your rear site has 2 flats you can install a scout scope or red dot. You need good .22 rings (Millett is what Ithaca recommends, I called and asked) just mount them as far forward as the grove allows, as they can slip.
