Any suggestions on how to attach racing harness shoulder straps while retaining use of the back seats? I've seen in other cars where the straps where attached to the back seatbelt holes. Would this be an acceptable (safe) solution? Thanks.

 

The Japanese.....and pretty sure I've seen a few examples on here too.....seem to be keen on using the rear belt pick-ups for their shoulder straps. funnily enough, it seems to be Takata belts mostly. The strategy seems to be, if their airbags don't kill you, they want to make sure you end up a para or a quad from compressive forces on your spine. lol

Assuming you're not wanting to take rear seat passengers onto a track, buying or making a rear harness bar with eye-bolts for the usual quick disconnects and having a seat allowing both standard and 4/5/6 point is the way to go if you must put amputees in the back row. Shoulder straps should be no more than 20 degrees below horizontal.

 

Good points. That's kind of what I'm seeing too. I think the angle on the belts down to the seat belt bolts is too steep. I wouldn't try to put full size humans back there, but I'm trying to figure out a way to keep the rear accessible so my young son can roll with us to car shows and the like without having to bring a second vehicle. May have to just keep the standard belts for road use and put up a bar for the occasional track day.

 

something like this?

harness bar

 

That looks like a good option. Thanks.