driver mounting depth for 97 maxima

I can't look much online here at work, and I haven't been able to find the answer at the places I can go. I need to know the Maximum mounting depth for the 6.5" drivers in a 97 Nissan Maxima (4th generation). My Iridiums I currently have are 2 3/4", but the RE XXX 6.5's I am looking at getting at almost 4" deep, and I need to kow if they will fit.

Depth will be with the stock plastic spacer installed, and if I can get any more spacer in there, i'd like to know how much before the driver hits the door panel.

Thanks for the help!

-Matt