What kind of 3 or 4 point harness can I put in a 2008 4 door . Is it possible to put them in the back seat?

 

It's not really about what type of 3 or 4 point harness but more importantly your anchor points. Make sure you so your research on the safety aspects of installing one. If anchored in the improper position you could potentially crush your spine if your in an accident. I actually have a 4 point harness out of a blackhawk helicopter in my rig.