Petrol tank to frame rubbers, ribbed, Norton featherbed (each). 2" long, 1" hole. Suits Norton featherbed frame. 1953-7 uses 6 per bike; 1961-62 ES2, 50, 8, 99, 650 uses 2 per bike. These fit very well and take out all movement on my wideline frame. Superior design to original rubbersOriginal Part Number:H12-2/289; 16237; 063204 - petrol tank mounting rubbers