Need Rear sight for 1886 .33 WCF|Winchester Sights|Forum|Winchester Collector

I recently purchased a beautiful solid frame 1886 in .33 W.C.F. The rifle was made in 1905, has a 24” barrel, 1/2 magazine and shotgun butt.  The rear sight is missing its thin adjustment blade and is also cracked where the body rests on the elevator.  I think it is a 24 B but I am not certain.  Where can I find a good replacement?