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Unless you go with a really deep speaker like those often found in component sets, you should not have a problem installing them in the doors. The speakers are an "oversized" 6 1/2 (some call it a 6 3/4), a normal 6 1/2 will fit if needed but an oversized speaker or an oversize adapter will make things easier on you and make the install cleaner and more solid. There is no difference between an oversized speaker and a normal speaker other than the mounting flange, so there is no advantage to using an oversized speaker as opposed to a normal speaker with an oversized adapter.
In order to get the right performance, make certain that your speakers are in phase - meaning, make sure that the positives are hooked to positives, negatives to negatives. On GM vehicles, RF is Light Green + and Dark Green -, LF is Tan + and Gray -. On my '98 Blazer and some other GM vehicles, there is a "pigtail" on the doors where the colors change to Dark Brown +, Yellow - on each side. Be sure they are correctly matched or your bass response will be horrible, and the life of the speaker will be compromised.
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