1967 Barracuda Seatbelt Mystery

My wife bought me new seatbelts for my birthday (yes!) as replacements for our 1967 Barracuda fastback and got them from a company called Seatbelt Solutions. Sitting them side by side they look totally different - see picture below. The one on bottom is the old one. The clasp is different and the retraction mechanism is totally enclosed. Anyone know which type is correct and where we can get a new set like the one on bottom if we decided to get another set?

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