Hi this sort of an older thread, but I thought I'd check in with you and see what you've been up to with the install. We basically have the same truck. Spacers for the 6X9's are almost required for a lot of aftermarket 6x9's. Mopar I have learn sells some really good kicker 6x9's. I have some alpine type r's and are very please, but although they will fit it not a perfect fit and some what difficult to get them in.
I'm almost certain that you can put 3/4 spacers in without any interference from the door panels. I'm going to some day rewire my speakers because I just tapped the factory wires and I'm also going to go ahead and get some spacers as well as some baffles.