760, 7600, 742 & 7400 stocks will interchange. All 4 of those will interchange with an 870, ONLY if the 870 stock is for a 20 gauge 'lightweight' model(post 1977). I could be wrong but I don't believe the 1100 stock will interchange, and if it does, it would be under the same conditions as the 870, ie 20 gauge 'lightweight' stock(post 1977).