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I found track belting 3 ply 3/8 think 600 tensile temp -25 to 225 tear and gouge resist. Minimum pulley is 20 inches stretch factor is 3%. This belting includes punching to what ever specs are. cost is 2000.00 includes shipping for 6- 8" drive belts 311" long. At 3% stretch they told me that over the life of the belt its max growth could be 9" over 311" long.