If it’s too long I have cut it in half (stretched old etc) set the alternator at a little less than half way (the adjuster bolt) on the bracket slot, lay one end of the belt in the WP pulley and make a mark on the pulley, then just continue wrapping the belt tight as I can around the alt and crank pulleys and bring the other end onto the WP pulley and mark the belt where it lines up with the other end or mark. Lay it out flat and measure. Really no need to make an extra trip or call around trying to find a belt measuring tool, being in the country vs. just round the corner from a store kinda dictates that option:)
