These sights have been discontinued, I have found a sound for the lk93 which is the round receiver but am looking for a set for the mk-85 which is more square/flat on top.

Anyone have a line on these anywhere? Part numbers  44540, 44541, 44542, and 44543( 44540 preferred as it’s black without target knobs, but beggars aren’t choosers)

Have you tried calling Williams yet?  If you live or travel near Davison, MI (Lapeer / Flint) you could drop in and ask in person.  They have gunsmiths on staff that might be able to help.

Yeah I called to see if they have anything in the current FP line that would fit; it was a no go and these have been out of production for a long time.  Figured posting here someone might see them posted somewhere else and be able to help with a lead, but if not no biggie I’ll keep looking