I saw those but didn't know if they'd fit or not.the dealer might be the only way to get the exact one you're looking for (the stock, new bonneville patent plate), but vintage patent plates fit and look better imho:
I did a search on ebaymotors and found several:
http://motors.search.ebay.com/searc...action=compare&copagenum=1&coentrypage=search
I got one from the dealer cost about 8 bucks.