How I do it is.
Cut your existing belt, Hold your tensioner about where it need to be (or a little looser). Then keep cutting little bits off until you have the length you need, measure, purchase.
Or you could just buy several and return the unused ones.
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2012 Tesla Model S P85
2013 Nissan LEAF SV totaled by now deceased intoxacated driver.
2012 Nissan LEAF SV
6 speed ALH TDI Swapped in to a 2003 Jetta Wagon
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