Thanks Grigg for the great detailed photos. The belts I have are pretty long so I'm thinking of bolting these directly to the rear of the under seat panel then fish the belts up and around seat cushion. Or I might be able to go between seat frame and the gas tank?
Wish I'd seen the retractable belts before I bought these. Also have some seat belt retractors that will roll up the outboard belts when not in use vs falling off the seat.