Hmm, oh well, was a long shot. N-prefix is VW code for nut/bolt, so makes sense. We'll get to the bottom of it
Think they changed from individual bolts and nuts to a set, think the set number is 171 498 088A, about 40+ per set + VAT
Not all bolts and nuts have the N prefix, but most do. That bolt kits fits most Scirocco’s, Golf’s, Jetta’s, Polo’s etc