From feedback from Les Eastling and myself, I thought it would be worth capturing the front and rear seat belt length and saving and pointing to on our Help Topics page. I will check out and add 1963 style (without retractor) seat belts at a later time. Thanks again to Les for helping gather this information.
Seat Belt Lengths provided by Les Eastling (Rears) and Jason Edge (Fronts)
Front Seat belts from a 64 with Retractor
Measurements: Given in two measurements for each belt: overall finished belt length and the overall unfinished belt material length since it is looped over and sewn.
Front Inner: Finished length 41" Unfinished length 46 1/2".
Note: on the bottom it is looped back around the triangular bracket 3 1/2", and on the buckle end it is doubled over 1" twice, adding 2".
Front Outer: Finished length (removed from retractor cylinder and flattened out) 20 3/4", Unfinished length 26 1/4"
Note: at bottom at retractor it is looped back around 2" which forms a loop for the retractor cylinder, at the top end it loops back 3 1/2"
Rear Seat Belts
See picture at bottom to use as a reference to the following measurements. The upper belt in the photo is the “outer belt”: the insert end, same as the outer front belt connected to a retractor. The lower belt in the photo is the “inner belt”, the end with the latch, same as the inner front belt.
Measurements: Given in two measurements for each belt: overall finished belt length and the overall unfinished belt material length since it is looped over and sewn. This can be seen in the upper “outer belt” in the photo… it is 21” overall but the belt material length is 28” since it is doubled over 3-1/2” on each end.
Rear Outer Belt: finished length 21”; unfinished material length 28”
Rear Inner Belt: finished length 38”; unfinished material length 44”
(4” loop on the buckle end + 1” double loop on the loose end for 2” additional inches)