It should be possible, because as I recall, they were an option (albeit a seldom ordered one) from the factory in 69. I believe I saw a set offered on eBay several weeks ago; seems to me they were out of a Pontiac LeMans convert. There might even be an illustration for the mounting in the factory assembly manual.
69 SS396 Convertible
"Life is short; eat dessert first." - Ogden Nash My low tech web page
I have shoulder belts in my 64 ElCamino. I got them from a 90 S10 in a junkyard. I welded a large washer to a nut and then welded it into the pillar. I'm not sure how well they would do in a crash. I hope I never find out. They look very strong, they are comfortable, and I figure they have got to be better than a lap belt.
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