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 .

 

Answer found in the FAQ for FC sticky thread found at the top of this section.

Please read the FAQ for FC sticky thread before posting. It contains many of the answers for commonly asked questions, such as the one this thread was started with.

Thread closed.

Covered in the FAQ for FC sticky thread