I need to replace the receiver top cover that came on my Arsenal SSR-85B which has a FEG stamped receiver. Kvar has either a Bulgaria Arsenal top cover or a East German one. Both are stated to be for stamped receivers. Would either work on my Arsenal? Other sites that I have found sell the Romania ribbed top covers for stamped receivers, would this one work also? Want to know for sure before I place an order. Help appreciated. Photo shows a East German receiver cover.