Shoulder Belts

Has anybody installed shoulder belts into an early A without using the seats with integral belts?

Aside from installing at least a 4 point bar, I don't see any good way to do this unless the roof is strong enough and has a good spot to weld a strong bung into it. The sad part will be the loss of the clean lines but maybe a shoulder belt and a seat with a head rest is worth the loss of aesthetics.

The buckets aren't much for lateral support anyway, and sit too high. :-?