Not sure exactly which what WO scope this was originally attached to, but I bought the focuser second hand to attach to my for my Esprit 120, I don't need the flange.
If you have a WO reflector and are looking at getting a moonlite focuser, this could save you some cash.
I believe it's the WO 132 Female 1mm threads ID 5.435", going for $100USD on their site with the purchase of a focuser.