After converting the front of my car from drum brakes to disc brakes, I wanted to make an upgrade to the rear brakes as well. After emptying the wallet on the front brakes, I didn't want to spend the money on a rear disc brake conversion kit or go to the expense of a Versailles rear end either. So, what I did was upgrade from 10 x 1 ¾ " brakes to 10 x 2 ½" brakes. The kits for this in the mustang catalogs and magazines go for upwards of $400, but I did it for around $200 and here's how: I started with the premise that Ford used the same 5 lug bolt pattern on a LOT of its cars, and that some of these cars were bound to have a 10 x 2 ½ brake on the rear. I went to the junk yard and through trial and error found a 1984 Lincoln Town Car that had what I was looking for. I bought the backing plates for $50 for the pair. Next I researched the 68 cars that came with 10x2 ½ brakes (like the 428 Mustangs) to see what brake cylinders, brake pads, etc, I would need, and what I was specifically looking for was a brake cylinder that used the same line fitting that mine already had so I wouldn't have to cut and re-flare the brake lines. What I actually found was that the same brake cylinders are used for 10x 2.5 as 10 x 1.75, with 7/8 " pistons. I could have used the same ones I already had but opted for new parts all the way around, including new axle seals. Obviously this could be done even cheaper if I had looked further for a donor car that had usable drums, re-used my brake cylinders, etc. I wish I had a picture of the backing plates to compare, but trust me, there is a difference in the off-set for the bigger brakes. The backing plates from the 84 Lincoln bolted right up to my axle housing and had the same holes as my original backing plate for the wheel cylinder, parking brake cable, etc. I chose to buy the hardware for the 84 Lincoln (the only real difference is the two springs that hold down the brake shoes via the "nails") because they were in stock and the 68 set wasn't. The first picture shows the passenger side almost completed...looks like regular drum brakes do. In the second picture you can see the difference in the sizes of the brake drums and the shoes, and also see how the 84 Lincoln drums have the fins for cooling. I know 84 Lincoln Town Cars work, but for other donors, here's what I found at the parts house using their old book (the computer doesn't help for this): 68-70 Mustang 80-89 Full size Fords (Custom, Galaxie, LTD, Crown Victoria, Country Sedan, Country Squire) 66-75 Elite, Fairlane, Torino 69-71 Station Wagon 63-65 Station Wagon 61-67 Econoline E150/100 66-74 Ranchero Now, here's the fun part. Not all of these cars always came with 10 x 2 ½" brakes, but some of each model listed above did. Make sure you measure the brake shoe before going to the trouble of tearing anything apart. I realized driving home that I forgot to check the Lincoln section in the parts book, so there's even more cars that are potential backing plate donors. Also, when you go to buy parts, make sure the drums you buy are the right 5 lug bolt pattern. For example, just because the Econoline van has backing plates that will work does not mean that the drums have the same lug pattern as your Mustang (trucks/vans have a bigger 5-lug pattern). For extra-extra fun, if you've already converted your front drums to discs, you could see if the backing plates from the front drum brakes (10 x 2 ½") will work on the back. I thought of this while driving home and realized that if the front backing plate bolts up to the rear axle all you'd have to do is drill a hole for the parking brake cable and save all the junk yard hassle. I'll leave that job to someone else though. Pep Boys was right down the street so they were my supplier, here's my parts list and expenses: Source Item Part number Unit Cost Total Junk Yard Backing Plates $25 $50 Pep Boys brake drum 0-30999-08250 $54.99 $109.98 Pep Boys wheel cylinder 0-30999-09464 $9.99 $19.98 Pep Boys re-lined brake shoes 0-30999-09061 $10.99 $10.99 Pep Boys axle seals 0-30999-1101292 $5.92 $11.84 Auto Zone brake hardware 7224 $5.29 $5.29 Total $208.08 Autozone actually had cheaper prices but didn't have everything in stock. Pep Boys had everything in stock so I had them price match to Autozone's prices. Here's Autozone's part numbers for the drums and shoes: Drums 8896 $54.99 Shoes 481 $10.99 I don't have any scientific data for whether or not this conversion really helps braking, but I can say that when I had 4 wheel drum brakes I was on more than one occasion literally scared for my life. Since converting the front to disc and putting bigger brakes on the back, I am 100% confident in my Mustang's braking ability and have had no problems at all with getting it to stop.