Couple of thoughts. Google Mustang Fasteners. There is a company that specializes in them. CRS has set in and I am unable to remember the name. Catalog went with the last mustang I sold. The area Mustang Club could also assist. In Fort Worth there is a company that has been around forever called Mr. G's fasteners.
mrgs@earthlink.net. Mr. G's has a wide selection of Grommets also which I have used on several Cobra projects. That should get you going. Colin