The Hertz I have are 6.5s. You may need to do some minor shimming but all in all it should fit. The shop I took mine to did take the better part of the day to do it... though I was the only one in the bay I know the guy gets pulled up front from time to time. But that was a component kit and he did an excellent job of setting up the crossovers... I've got the h/u totally flat on the eq and it sound brilliant. Although I could have done the physical install myself, I doubt that I would have been able to do it as cleanly and it certainly wouldn't have sounded so sweet.

It was worth the $180 to me to not have the car apart in the driveway all weekend... and then rip it all apart the next week to tweak the crossovers.

 

Nope, you're right.