Originally Posted by BillGrissom

For all V-belts in all cars, download a catalog like Gates. They generally come in 3 widths, with lengths in 50 mm increments, as I recall. Newer belts usually have a label like AV1130, meaning 1130 mm long OD. Some list the length at the mid-section. Once you get the length code, search ebay and Amazon. I had to try up to 3 belts to get a perfect fit for custom AC brackets on my 1960's Mopars, due to estimating length w/ rope, varying length definitions, and limited swing on the compressor. But most cost <$10 and oops go in my V-belt box. For the M'-B alternator, always but a matched pair.