I purchased two Disk ][ belts from Console5 in the US but did not realise my drives are not Shugart. So they don't fit. They are brand new and maybe someone can make some use of them.
They sell for $12.95 + tax each. Happy to sell them for £5 each plus shipping. I live in the UK, I reckon shipping them in a Jiffy bag is only a couple of pounds.