Replacing HK speakers, please help

[BMWKrazed]

I have already replaced my door 1" tweets...and im looking for the other 3"(?). Im pretty sure the kick panel speakers are 5. 1/4 (correct me if im wrong).
Im am most concerned about figuring out how to replace my rear speakers. What SIZE?? But MORe importantly, How do I CONNECT them using the 5 wire plug. Whitch leads do I use for the standard 2 wire speakers??
any help would be appretiated. thanks.


-Mike