Backing plate

If you can't straiten out the backing plate you will have to replace it. The cylinder must sit flush with the plate

I don't know much about your rig.I do best with jeep cjs

But some wheel cylinders are specific to the driver's or passenger's side

Are you sure you don't have one for the opposite side?

The parts store guys make mistakes too!

"rigging" something is not the answer!---If indeed it's a damaged backing plate---replace it---them brakes are sorta an important feature on your car!

You might find one at rockauto. Com

Keep us posted

The medic

I reckon you sorta see that changing the backing plate will be an "involved" job

Anytime i work on something i'm not familiar with i get a repair manual specific to that rig.....i have many manuals for my family's vehicles........if it's for someone else, i make them get their own manual! I explain, $30 now may save them mega $$$s....it will be useful for their next repair too....and other info too!

Http://www.2carpros.com/questions/2007-ford-taurus-tune-up

This would be your best bet, doing it yourself, things are step x step and they don't accidentally leave stuff out....and they give you torque specifications...something that gets left out by many giving you a quick answer.

You tube is a good place to "get the feel" of what you are about to embark on---i'd use it as a guide, but adhere to the repair manual sorta as "law" ......you might change the search words i used and watch the suggestion videos down the side

Warning!!! They throw in girly stuff, just to steer you in another direction.....mama might not be happy to see you watching them instead of the "how to video"

I have gotten you started on "a search" below, your take over searching

http://www.youtube.com/results?search_query=1992+cadillac+deville+rear+brakes&oq=1992+cadillac+deville+rear+brakes&aq=f&aqi=&aql=&gs_l=youtube.12...840535.856441.0.858457.22.20.2.0.0.0.94.707.20.20.0...0.0.

Something that may help us help you would be some pics of the situation.......like several different shots of the plate and its damage----the wheel cylinder "starting to go in"---cylinder in but do no more damage......well lit....in focus...point at and 'splain stuff too

Pics are ez to post---maybe we can give a better solution without all of the changing out trouble

Your turn

The medic

Go to the salvage yard and replace it.

Let us know when you're all good to go.

The medic

Hey boss!

I figured Autozone would be more nationwide.

I used the car info from the beginning.

Seems there are two wheel cylinders available for the '92

They are not left and right,

They are the "Bore size" and the brake drum diameter.

Once you determine which one you have, the same cylinder will fit either side.

I screenshot the deal below. Is this the info you need?

The Medic