I'm sure Dan would like to know for sure too as we are both after S1 parcel shelves. We know the Mk3 ghia shelves were the same as S1's. My 1983 3i shelf looks the same as the S1 shelf but with the speaker holes cut in the back not in the front like a S1 shelf. Is this the only difference? Thing is, i don't know if my 3i shelf is original. Were the RS 1600i shelves the same? How did ordinary MK3 shelves differ from S1 shelves. Can anyone shed any light? cheeRS