Any of the vendors that carry all of the pieces for these old cars have rivets available seperately. I usually deal with Olof at vintageimportparts.com, but veteranproductor may be closer to you. They will have hints and I think tools to use (buy) to do your installation. I'll guess that you'll have to carefully drill out the old rivets, put the new ones in, (and here's the clincher, so to speak) figure out how to peen the new rivet without breaking your window or ruining your trim. On my '67, I was lucky enough to find a door at a swap meet that had all of the window jewelry in OK shape, so it was just time involved in changing door locks and interior trim panels, etc. Good luck to you. A full service upholstery shop may have done this kind of procedure before. They might do it for you fairly inexpensively if you have everything out of the car and ready to go. Let us know what you find out!