well when i bought my EK the harness had been hacked so there was no plug. NO ONE in the area ie: DAS, GO-HO ect. could put a 99 si radio in it because they dont carry the plugs. so i got an aftermarket one put in. well after searching the web i found places like installer.com who sell em. so now im going to buy the plugs and put it in my self. so really you can put any factory radio in that you want... you just have to be sure that the male and female connectors are the same.