There are 4 different sizes of car radio openings, with some variations and exceptions to each. In the beginning there was the shaft mount radio, which had a nose piece and two shafts, one on either side. This design is no longer used, but there are still many older cars and trucks with this type of opening.
The most common size in use today is DIN. It is approx 7" w x 2" h. There are three variations: 1)ISO-DIN, which has mounting brackets on the sides of the radio; 2) J-DIN, similar to ISO-DIN, but the control panel is wider; and 3) Euro-DIN, which is the type that uses a metal sleevemounted in the dash which the radio slides into.
GM and Chrysler vehicles use a DIN and a half, which is 3" tall, but usually only has about 5" of mounting depth. There is also double DIN, which is more common in Japanese vehicles. This opening is 4" tall.
Lastly, there are the oddballs that don't conform to any standard. The most common example is the '88 to '95 Chevy/GMC full size pick ups. These had a square, shallow dash control center with the cassette deck mounted way off in the center of the dash. It is possible to mount a standard DIN size deck where the cassette is with a mounting kit.
Hope this helps.
Crutchfield's catalog is a good source of info for which vehicles will accomodate which type of radio chassis. Give them a call at (800) 955-3000 to request one.



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