Hi Ponch,
If I am right in thinking that the '75 Sport had the short, top folding kickstart that continued to be used on the Strada up to 1978 - the one that is no good with rearsets - then I can help you. The spare one I have is a little rusty, but is not worn. If you don't mind either the rust or don't mind getting it rechromed then send me a PM with your details and you can have it for a fair price.
regards,
George.
George
350 sport 1978, 350 Strada 1978
650 Norton 1967, 650 Kawasaki 1977 and 650 Enfield 2019