If you decide on the Wesco Roadster unit, this is what it looks like with the retractor mounted at the shoulder belt location above the quarter window.  The other end of the belt is attached at the outboard seatbelt location on the floorboard.

Thanks guys, that's very helpful. I had a brain-fart in there somewhere, but I finally get how the wesco roadster belts work. They're a lot like the mid 70s camaro belts: 1 retractor at the shoulder point, and you adjust for waist by sliding the buckle up/down the shared retractor belt. Makes perfect sense now. 

I started out thinking we'd have to fabricate 2 mounting points, but ended up knowing we don't need to fabricate ANY. Which is awesome, from a keeping-alive point of view. 

 

7 minutes ago, Warty said:

Thanks guys, that's very helpful. I had a brain-fart in there somewhere, but I finally get how the wesco roadster belts work. They're a lot like the mid 70s camaro belts: 1 retractor at the shoulder point, and you adjust for waist by sliding the buckle up/down the shared retractor belt. Makes perfect sense now. 

I started out thinking we'd have to fabricate 2 mounting points, but ended up knowing we don't need to fabricate ANY. Which is awesome, from a keeping-alive point of view. 

 

Exactly. If you search for WESCO on this website, you'll find we have a few threads here on their seatbelts. There are many of us who like their products.