I have a pair of NOS carb inlet rubbers that I bought I don't know how many years ago, thinking they were for my 4L0 350LC. When I cam to fit them, it's clear they're not, as the bolt holes don't line up when the rubbers are fitted into the reed blocks. Looking on Norbo's YPVS page it seems that they're not YPVS items either, as the balance pipe inlets are a lot taller than mine. Do any of the air cooled RDs use these rubbers? The balance pipe inlets are (as best I can measure) 11mm diameter and the carb inlets are 34.5 - 35mm diameter.