mounting depth problem

[pr5owner]

i did a search and i found out that the depths are 2.5" and 2" fron and back respectively. my question is, are the back speakers mounting depth of 2" flexible? i want to get these PPI speakers i found but the 6.5's mounting depth is 2 13/16"!!! their carbon fiber speakers!!!! HOW CAN YOU RESIST! see them here

https://www.onlinecarstereo.com/car...t.asp?sku=11216

and also the 5x7 here, they will fit okay i guess 2 3/8"

https://www.onlinecarstereo.com/car...t.asp?sku=11214