i could have sworn 2drs had 6x9's in the rear...

 

I know that in the 4 door it is 6 1/2 all around. I think in the 2dr it's 6x9's

 

I could be wrong. I know that mine are 5-1/4" but then again it came with bose and I know how Bose doesnt like to use oval speakers...

 

oh may bad didn't even notice that it was a two door sorry!

 

From Crutchfield.com:

Factory replacement info 2001 Blazer 2dr:

In-dash stereo
5-7/16" depth; Size code E

Front speakers
Dash: 4x6"
Front Door: 6-1/2" factory speaker note

Far rear speakers
Mid Panel: 6x9" [/align]

 

Yeah that seems like the correct size