Saw some great 6 1/2" round speakers i'd like to put in my 67 chevelle. Was thinking about in the flat panel up behind the rear bench seat...will they fit?

Thanks in advance!

They will fit on the shelf behind the rear seat. Mine are sideways.
Easy to hookup.

Sure they will because the panel is set up to hold 6 x9 speakers. Go for the 6 x 9s if you have a choice

word 6 x 9 and 6.5's in the kick panel area...works nice if you are willing to take the time.