I just looked at the belts in both my 70 XR-7 and my 71 XR-7. Both have Deluxe belts(and per Marti reports) and all are from Hamill mfg. I didn’t look at all the dates but the front belts in the 70 have 39-69 for week 39 of 1969. That Cougar was built on Nov 12, 1969.
Neal, Thanks for your input. Interesting, your car was built 8 days after mine. Just recently, I did buy a complete set of 70 seat belts from a guy in Danbury, CT. That set has Robbins belts in the front and Hamill belts in the rear. But, the Hamill belts were made during Work week 22 of 1970. (22-70). This set is in better shape than mine.
Randy, Thank you for your experience over the years with the Cougar. I’m only a couple of years into the car. It was 95% restored when I bought it in 2019. I’m still finding out interesting things about.
What about color? Some colors likely were not produced at the same rate as common black seat belts. I would hesitate to draw a straight line conclusion, of lead times for a car build date and seat belt dates without considering color.
We have also seen small belt buckles mixed with large belt buckles on 1970 convertibles. Convertibles do not have retractors on the front male end of the belts.