HELP!!!! I Need Brake Availability Information.

I have a NOS brake drum that the part # states is a rear drum. I don't know if the same one works for the front. It was originally ordered for a commercial chassis car, but never got installed. $50.00 plus shipping.
 

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Consort should be standard heavy duty pontiac parts. Rock auto will have everything you need for it. As will you local parts store. Compare parts plus shipping to see which is cheaper. The nice part about the Oldsmobile, Pontiac was they used standard parts.
 
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The only problem with getting replacement drums is that the original drums were swagged to the front hub, and finding people who still know how to do this and finding the correct swagging studs might present a problem. The wheel cylinders, linings, spring kits, etc. are all still available today from both Rock Auto or any of the local auto parts stores. Just do one side at a time so you have the other side to use as a reference. Before you start working on the brakes, first remove the brake drums, and then spray the old brake assembly with a solution of dishwashing liquid and water to loosen up all the grime and then either pressure wash or wash with a high-pressure nozzle on your hose. No need to worry about brake dust *asbestos) if you do this first. Your car originally had riveted linings, and you can still find NOS (new old stock) riveted brake linings on eBay. I just replaced the front brakes on my 1962 Chevrolet with riveted NOS linings that I bought on eBay.

Checking the Rock Auto website, they don't offer either front or rear drums. If there is an old auto parts store that still has a brake lathe, have the old drums turned and ask them to take a very light cut, just to clean them up.
I also checked O'Reilley Auto, and they don't list the drums. I did find that a pair of used drums did sell on eBay in September, so that is the best that can be done, is to watch eBay for some used ones, or contact one of the salvage yards in Arizona.

Update:

Search eBay for "NEW Front Brake Drum 11 x 2 1/2 , 1959-1964 Pontiac Fullsize 59 60 61 62 63 64" There is a seller that has more than 10 at the price of $99.99 and $20.55 shipping. I would buy a pair even if you don't need them right now, because in a few years, who knows if they will still be available?
 
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I have a NOS brake drum that the part # states is a rear drum. I don't know if the same one works for the front. It was originally ordered for a commercial chassis car, but never got installed. $50.00 plus shipping.
GM Part Number 9794455 is replaced by Raybestos Part Number 2665R. Below is the application chart for that part. Unfortunately;y, it doesn't fit the 1963 Pontiac. Below the chart is the application note.

CHECKERAEROBUS1970-1971
CHECKERMARATHON1970-1971
PONTIACBONNEVILLE1964-1970
PONTIACCATALINA1964-1970
PONTIACEXECUTIVE1967-1970
PONTIACPARISIENNE1964-1970
PONTIACSTAR CHIEF1964-1966

Related Parts
PONTIAC > 1964 > BONNEVILLE > 6.4L 389cid V8 > Brake & Wheel Hub > Drum
Price

RAYBESTOS 2265R Info
Rear; Do Not Use with OEM Metallic Lining; with Finned Drum; with 11" x 2" Brakes
 
Might need to find a mechanic shop to trim the drums. I went looking here and the parts stores no longer offer that service. They claimed the new standard is not to trim but to replace.
 
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