The shoulder straps might be uncomfortable since ther have to come over the high backs on the seats. I am not tall and the top of my seat back is as high as my head when I sit in the seat. another option is to get belts from a junkyard. You would need one piece belts with a single retractor at the bottom and a stationary top mount. Look in late 70's to early 80's cars many of them had seat belts like this.
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73 coupe, 351W, GT-40 heads, edlebrock 750, offenhauser intake, .488 lift cam, 2.5 exhaust, 2 chamber flowmasters, blah, blah, blah...
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