1995 factory speakers

my friend has a 1995 jetta but she is not sure what size they are and they are starting to sound muffled. i was gonna take out the speakers from my old car and put them in hers but i dont want to drive an hour away to figure out what size they are. i was just wondering if anyone knew what size the rear and front speakers are. i wanna guess that the front ones are 5.25 and the rear maybe 4x6 but i'm not sure. can anyone help me out?

Go to Crutch field.com and look at the "What fits my car link" They sat 6 3/4 in the doors and 6 3/4 on the rear deck. I am pretty 6 1/2 will fit all around.

they are all 6 3/4, and will require cutting the existing metal to get the 6 1/2 to fit. front dash components are hard to find.