How much of your car is there? What are you looking for.
Superb Bee, the R/T is complete with no rust. I've recently got the car and learning Mopar from scratch. Everything is new to me right down to fluid changes. A lot of parts are fairly worn such as switches, wiper motor, seat fabric, dash, etc. The reason I posted my question was I didn't know what companies were good or bad. Based on previous cars (Impala SS, GTO, Gran Sports) I've had I can do 60-70% of the work. My budget is somewhat limited, but I'm estimating 2 years to be done. That will allow me to extend the costs. I'll post pic's soon. Remember this R/T is a 20 ft car, looks great till you get close, Richard
Wanted to thank you for that excellent list of R/T parts. As I've searched the internet for parts, I've noted how costly and how limited R/T parts are.
Here is what I consider the tough to find parts, that are not yet repopped, lol.
Grilles (will be repopped again, but so far what I seen is HORRID, you need to have or find good oem grilles)
Rear Bumper
body parts- hoods, Fenders, Quarters, Front valance, deck lids, and tail panels
Front bumper applique (goes over the lower filler bumper, for a painted bumper)
Front Headlight tin shields and the plastic shields, the tin set splash sets are tough to find not junk as are the plastic ones that go right on the headlight mount. both hard finds.
Bumper rubber isolators (these are little rubber wedges that go in the bumper brackets)
Anything OE 70' rallye dash, lol ash trays are tough because they aren't repopped, and easily disappear, radios, glove box lights, and a/c vents all tough, the rest is repopped...
OE side scoops (now repopped, I installed a set on a clone, I prefer the real thing, even I have to fix them.)
Hood latch assemblies
R/t deck lid trim
That's about it lol, if you have them parts GREAT, if you need some of them, start with that list and find them parts (all of which I have duplicates of

.
Everything else can be bought new, classic, year one, mega, mcm, ebay, all them sources have tons of the repopped stuff.
70' coronet is a fun car to build, but can be frustrating when you see all the other parts popped and available and you are shaping and welding rear bumpers that should have been thrown away 30 years and 100k miles ago.
good luck.
PS can we see some pics of what you are starting with? An idea of your budget and timeline and how much of the resto you are doing yourself?