The Simca 8 Sport was built in 1950 and 1951 as a convertible and coupe, then as the Simca 9 it was built until 1955.
The design was by Pininfarina and the cars were built by Facel-Metallon who later became Facel-Vega. It does have a great history even though its circa 50 hp does not make it very sporty.
This site shows photos of existing cars, which demonstrates many more than 8 were built - perhaps 8 imported in the USA.
There might be a parts stash waiting for you somewhere in California, but you'll most certainly end up importing parts from France. This specialist is an example of what you will find.
The French are not easy to deal with online. I have two friends overthere who might be able to help; I'm shipping parts to one of them as he owns the only AMC Marlin in France (!) and the other one owns a later Simca Plein Ciel.
It looks like I need 2 hub caps, a license plate light, trunk handle, and front grill emblem along with an air cleaner. I would love to find 60's speed parts for it but from what I've heard, they only had finned valve cover and a dual carb set up from Abarth.
I have the VIN number and would love to know the quantity of these cars. It seems like Facel-Vega didn't keep the best records.
I see you're buying the car that was from the Palmdale area that has been listed recently on CL. Looks like a fun project.
As far as numbers are concerned, over 3000 coupes and cabrios were made. Of these quite a few came to the US; surely in the 100's. There was a dealership in the Hollywood area called International Motors, owned by Roger Barlow. As this is a West Coast car, maybe sold by him?
Mechanical parts are easy to get out of France, as Yves mentions above - try Auto 4A: https://www.auto4a.com/catalogue/simca-8-1100-1200.html
The body and trim bits you need are tough to find, but out there. Keep your eyes on the French ebay site.
This car is an earlier model with the center instruments.
I know of about half a dozen 8 Sport enthusiasts in the US with car(s).
Congratulations on the purchase. These are great cars with wonderful styling and good road manners, albeit under-powered.
For the speed items you might look for Fiat 1100 & 1200 items as many mechanical parts are close enough to be easily modified to fit.
John de Boer keeps a serial number and body number list so you should reach out to him with questions about build quantities - he posts frequently on this BB and might chime in directly. The year denoted on the title may or may not be the actual year of production so it's always interesting to confirm utilizing the collective knowledge of the community.
If you have a French-speaking connection I recommend Depanoto, but their website barely scratches the surface of what they can supply. And calling or emailing in English is an exercise in frustration.
The license plate light/surround and badge are both available as reproductions, you just have to ask around for them. The trunk handle and hubcaps will simply take some searching but they turn up on occasion. Keep an eye on Leboncoin.fr - the French version of Craigslist.
The body design for the Simca 8 came from Stabilimenti Farina (with Michelotti in the mix) rather than Pinin Farina. Pinin Farina was certainly building similar shapes for Cisitalia and on some Fiat chassis, as was Vignale for a time. Stabilimenti Farina also built some similar bodies on Fiat chassis.
Without devoting a great deal of attention to the study of Simca 8 cars, I have collected information on more than 60 examples existing today. I am certain that there are many many many more that are existing today. Of those that have supplied a chassis number, 38 are cabriolet and 16 are coupe' plus seven chassis that are not described overtly as to being either cabriolet or coupe'. A few cars are known but the chassis number has not yet been supplied. I do not have great confidence that all chassis numbers supplied are correct. There is the potential to confuse at least two other numbers appearing on some cars as a "chassis number".
I have chassis 897178, ostensibly a coupe from 1951.
This new addition (chassis 8836xx ??) seems to be a solid "1950" car but this does not mean that it was first sold into the marketplace that same year. Every car is an individual and we can learn only so much from similar examples if we wish to honor the potential for individuality that any one car might have had when first sold ... and then what it became as early history was made.