front speakers

i have a 2000 grand am se and i know that the front speakers are supposed to be 4x6 but could i fit in 5 1/4 x 5 1/4? I bought nice speakers for my jeep but they were all 5 1/4. I would like to use my existing ones.

HPC2205 Rockford Fosgate 5.25" (Fanatic High Performance Speakers)

you should be able to fit them in the car door. i have 6 1/2 in my 97 GA