changing 6x9s issue

[Aler01]

Hi,im new and i have a few questions regarding replacing the 6x9s in the rear deck. i've searched other threads and havent found an answer.
recently, i took out my blown 6x9s and disconnected them from the monsoon amp. I intended to install the Infinity Kappas 2-way speakers, but they wouldnt fit,without some cutting/modification of the rear deck.
Does anyone know of some aftermarket speakers that do not require cutting of the rear deck to install? any suggestions from previous experiences with changing the rear 6x9s?

btw. I have a 2001 GLS with the factory upgraded audio system, stock head unit is in place and monsoon amp is in the trunk.