My '73's had the three point belts but they had an insert in the upright center post where they bolted. You'd have to fit a nut-sert to use any of the three pointers. I don't recall seeing retractable front belts in any of the older W114's (pre-73) I've owned. They all had the "airplane" style latches.

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“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.”
― Brian P. Cleary, You Oughta Know By Now