Dayco Belts - manufacturing moved out of USA

lemondana said

As I've said before, the belts numbers starting with a 15 are not really the correct belts for our Mopars. They are supposed to have a 13 series belt, which sits down in the pulley like it is supposed to. All the belt manufacturers phased the 13 series belts in the early 90's I believe. So we are stuck using belts that really don't fit correctly.

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Now that is interesting.
13 for Dayco is 13/32 (nominal top)
Gate's listing by application starts with a 7. I haven't checked into what that represents.
Maybe tommorrow I'll have a chance to dig into the industry sizings vs design.

If someone has any old Chrysler belts it would be great to get some measurements.
Or some belt catalogs from the late 60s and 70s that would be interesting too.