>I did the rear shoulder belt conversion

It should be possible to fit inertia reels for the outboard passengers,
though you'd need reels that bolt to the high mounts and can work inverted.
I fitted early-80s Mitsubishi Mirage (whatever they sold as in the
US...Colt?) reels to my 89 Corona's rear pillars. These reels are mounted
upsidedown in the Mitsi. I'm thinking of doing this in my Caravelle.

For short front-seat folk a hanging adjuster could be fitted. My 88 SR31 Skyline
4-door pillarless had hanging loops which were adjustable, and I think
bolted to normal belt mounting points in the roof.

Andrew Grebneff
Dunedin, New Zealand
VW & mollusc nut
1969 Kombi with Corvair 2.4 & Powerglide
1975 Kombi derelict ex 3.6 Toyota V8
1984 Caravelle 3.8 Holden V6
1984 Mitsubishi Galant Sigma 2.0 (FWD)
1986 CE80 Toyota Corolla 1.8DX diesel
1989 CT170 Toyota Corona Select 2.0 diesel