what was the last year for just lap belts?

goldfish65 said

Could your Valiant have originally been a commercial vehicle? Shoulder belts weren't mandatory equipment on those cars, from what I read.

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It possibly could have been. It was as bare-bones as they come. According to the build sheet, it appeared the AM radio and automatic transmission were the only "upgrades", if thats what it would be called, it came with.