It is notable that both Belts bear the VW Logo and the Identical VW Part Number.
The “reinforcing ribbing” is not the only difference. The webbing for the non-ribbed version is black while the ribbed version has gray webbing. Note, also, the difference in colors of the catches.
It is suggested that the manufacturer may have discovered, during the manufacturing year, that the non-ribbed version was subject to breaking at that point and began producing the ribbed version with no hesitation during manufacture–thus, also no change in the part number.
These are “Reel” Seat Belts used for all USA Deluxe Model Beetles for 1967 and into early 1968 Deluxe Model Beetles to VIN 118-096-785.
The Belts are Right and Left. Part Numbers are as follows
Right Belt: 111-857-706
Left Belt: 111-857-705
Convertible 1967 Beetle Seat Belts have the following VW part Numbers
(Note: 141- usually denotes Karmann Ghia Parts. However, in this case, both the Beetle Convertibles and the 1967 Karmann Ghias share the same Belts and, thus, utilize the same part number.
Factoid: the final digit of a part number usually indicates right if it is an even numeral, and left, if it is an odd numeral.
Ernie Radley—a fellow Texan who is restoring a 1967 Beetle. Ernie took the comparative photograph of the Seat Belts.
David Brown—of Pennsylvania whose “air cooled brain” thinks in terms of Volkswagen Part Numbers!