Thanx, Mittaw, saved me from an embarrassing / expensive mistake !
Back to the 507 now. I've decided how to delete the 500 from the Fiat boot handle. I'm going to cut out the area and put a plate in that hints at the original key escutcheon. Still debating if I should cut out the "507" numbers and put a reflector lens behind. Once cut out I'll try the trusty CAD ( cardboard aided design) mock up to see if it looks OK or not. If not, I'll simply replicate the ridged effect on the escutcheon plate, maybe with a fake lock button.The Ivory coloured banjo steering wheel arrived today and I've ordered the relevant BMW medallion for the horn centre. BTW, if anyone is tempted to buy the 507 "Saga 2" ref book - the content is excellent, but the paper quality and graphics are appalling, not what you'd expect from a £46 book. Mine's gone back for a refund.