i went to change my O2 sensor. i went and got a gm 1 wire. got home and went to take mine out and i found out that i have a 4 wire heated O2. it looks like a Casper harness. i need to know where to get just the O2 sensor? can i go get a gm 4 wire, or do i need to get it from Casper's? i did some research and some say its a o2 from a ford and some say its from a dodge srt, i need a part number or something. thanks for your help