I had a rear sight leaf problem on my Perdersoli Carbine. Pedersoli said they'd ship my one for about 90.00 and they were sure I'd get it, eventually.
Took a flyer, ordered an Original from Grandpa's guns online.
Darn thing went right in, and had the same zero.
Kinda backwards of the way you went, but maybe illustrative of the commonality of parts?