I am constantly going to my local true value with a sample nut and bolt to get replacements for the lost or rusty bolts, for mounting a rack they should be pretty standard and are nearly always metric. And +1 on racks beating back packs or messenger bags.(which I used to use). I love having racks and it makes moving panniers or bags between bikes easy when you have an um...issue with bike acquisition...have fun dialing in the Raleigh. Free bikes can get expensive