Rear Disc Brakes from what?

Hey guys looking into rear disc brake options for my '64 Falcon. Currently has a small bearing 9 inch that is narrowed 2" compared to the stock 8".
Surfing the web has revealed several very expensive aftermarket kits but I'm a bit of a more time than money guy so junk yard swaps are usually easier for me. Looking on e-bay (I know) there are several similar small bearing kits (Used) salvaged from some other vehicles.
eBay Motors: 65-73 Mustang rear disc brake conversion (item 200157914075 end time Oct-06-07 21:40:28 PDT)
or
eBay Motors: 65 66 67 68 69 70 71 Mustang Rear Disc Brake Kit Falcon (item 280156510873 end time Oct-02-07 18:30:00 PDT)

Any Idea what vehicles these are harvested from and what Modifications are needed to the axle flanges to make them work? any other options?
Side note; I already have a GeoMetro power brake set-up for the car and granada front disc's installed.
Any info is always appreciated.
Russ.....

91-95 Town Car, Crown Vic, or Grand Marquis
[CM] Re: 1966 Mustang GT350 rear drum brake upgrade

thanks for the link, Very good write up on the swap.

Scarebird Classic Brakes has a small bearing 8/9 inch bracket for around $100. I order there bracket for the front disk brakes. Very well made piece, I thought.

They send you the bracket, and a parts list of stuff you can get from a local parts store new. The front disk setup I have uses GM calipers and 2WD ranger rotors. I priced the entire front disk conversion on my Falcon, including the price of the brackets, at ~$360. I thought that was pretty good.

Just something else to look into and consider. Scarebird has some stuff on ebay as well.

I used the scarebird setup on my Comet rear. It's a pretty good setup. The brackets were 105.00 and it come with instructions and a list of parts necessary to complete the installation, I installed the whole thing for less than $250.00. You have to do a little modifiing to get the rotors to clear the axle flange. You can use an angle grinder to knock off about a 1/4" of metal off the axle flange, I just paid the machine shop $20.00 to lathe the 1/4" off both axles, it was much cleaner look. Everthing else just bolted into place. They stop very good.

$105.00 brackets from Scarebird
$51.00 Chevy Lumina rotors
$20.00 Two used Eldorado calipers they have E-Brake setup on them
$18.00 Two caliper rebuild kits- Oriell auto
$21.00 Two Caprice brake hose
$20.00 Machine shop service
$235.00 Total