These rings should fit most 80mm and 90mm Short Tube refractors. The bolt holes have been re-tapped to accept 1/4 - 20 hex socket head bolts (included) and the rings will attach to standard 1/4 - 20 camera mount bolts. The felt pads were redone this fall. Asking $25.00 shipped in the CONUS. Cashiers check, money order or paypal.