The quest for antique motorcycle parts has been greatly enhanced by the internet. When I restored my first couple of bikes all searching was done on the phone or at swap meets. I have purchased parts off of eBay, through contacts on Craig’s list, at swap meets and from contacts I have used in the past. There are also more replacement parts for the popular old bikes like BSAs, Triumphs and Nortons. Although I like to use NOS parts they are not always available or affordable. A list of suppliers I have had good luck with is in the “Parts and Services” section of my blog. I have used other sources but left them off if I would not use them again. Good Luck!