Yes, these are 151mm - 153mm wide. You’d have to cut them to width, probably get ten belts from each one.
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$13 for 1
$14 for 2
$17 OBO for all 4
Four of these can probably make forty 275-5M-15 belts if you have a way to slice them straight. I’m not going to mess with it. Each one is wide enough to cut ten 275-5M-15 or twelve 275-5M-12
Why not try to slice them yourself? You just stick a box cutter though and pull the belt along the blade, then cut the strand with diagonal cutters. It’s a continuous spiral of steel or kevlar wire