My friend is going to install a seat belt harness for his sparco seat in his s2k. I have no idea how to install it in his car. Which locations should i use to connect it? It is a 4 point harness. Thanks let me know.

the harness bar?

I meant to say, sparco seat belt harness 4 point.

try s2ki

you would need to bolt in a roll bar to properly secure it to the car... the rear bulkhead isn't strong enough and the eye-bolts will pull right out in the event of a crash.