6x9 and tweeter suggestions?

[>>SQL<< 10+ year member]

like these ones Cadence Acoustics ZRS55 KS 120 Watt Peak Low Profile 2 Way Speaker Component Kit 812902005973 | eBay

 

[JayWheezy 10+ year member]

Alright, that makes sense, but I was planning on replacing my stock tweeters with the newer ones, and putting the 6x9's in the back. Would that still be bad?

 

[JayWheezy 10+ year member]

Still would appreciate more input from others, especially towards that last little bit. Sorry for not clarifying, I was looking to replace my stock tweeters located in the panels along the windshield, not just add another set of tweeters.