Speakers....
 

I was just wondering wut the size of the front and back speakers are on a 87' turboII im going to be picking up speakers and a cd player today.

Well, I have an 86 GXL, but it should be the same.

Under the dash, put 4" speakers (you could fit 5¼", but there's no way you can fit it with the stock grill on the driver side without a lot of custom fab).
At rear, stock speakers are 4", but it is really easy to take the stock plastic platform a make the hole bigger to fit 6½" speakers.

And by the way, I recommend you to put 6½" in your doors instead of under you dash. I have nice infinity kappas 5¼" under my dash and I can barely hear them since they face downward :(.

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