With some time and searching online, you can find the vintage car and truck part you might be looking for to restore your vintage buggy.  There are sites online to find aftermarket car parts or custom car parts and accessories by make, model and year.

You can find custom car part and accessory kits for just about any year, make and model made.
You can find OEM replacement parts and accessories at various car and truck places online. Some offer free shipping on large parts.

Engines, clutches, brakes, tail lights, and much more can be found online with a bit of searching with your favorite search engine.

I did a search for vintage car and truck parts and found catalogs for Chevrolet cars and trucks from 1947 through 1959 and 1960 through 1972. I even found vintage auto parts for a 1932 Model B Ford.

You can find V-8's and even a custom car part or accessory for muscle cars online if you need them.

Any custom auto part and accessory, or vintage car and truck part can be found online, and with a lot less work and time on the phone trying to hunt some part down.