i want to have some harness's but i want to be able to have people in the back so what i was thinking is leave the original seatbelts in and then when people are in the back i could use them.

so what i wanted to know is there a harness that i can get the plugs into the rear seat belt catch?
basicly with one of the clips in the pic on the back

if not is there any other way of doing it?