Rumble Seat, seat belt question

Anyone running lap belts in their rumble seat?

I imagine it would not be hard to add them, but I would like to know if anyone has done this.
Thanks

 

My roadster has them. My daughters both rode back there in their car seats when they were little, but haven't had too many takers in recent years. Maybe my (world's most beautiful) granddaughter will start logging some time back there soon, although she seems to like shotgun..... and her grandmother is pretty much over the joys of roadstering.....LOL