Will these speakers fit?

Will these speakers fit my stock 01 gtz? http://www.infinitysystems.com/car/p...?prod=REF9623I

They are Infinity Reference 9623I 6x9" 3-way speakers. Will they fit directly or would I need to buy anything else or make any modifications?



Also, which of these 2 speakers will fit the front dash center speaker without any modifications?

Infinity Reference 3022CF 3.5"
http://www.infinitysystems.com/car/p...=US&Region=USA

or

Infinity Reference 4022I 4"
http://www.infinitysystems.com/car/p...=US&Region=USA

The 6x9 will work just fine in the rear.

I actually have the 6x9 and they fit but the magent is a little to big and it hit the torsion bar in the trunk so when u open and close it rubs a little....nothing to major.....you could put spacers when u install them so u dont have that problem....It doesnt bother me that much so i just left it as is....Sounds a lot better then stock though....

no speaker will fit in the dash without some modification unless of course you just replace it with a new stock one...but the 3.5 will probrobly be your best bet just make sure that it doesnt have a high tweeter on it or the cover wont go back on