Grizzlar Rubber Tensioners. Please see below tables to select the right rubber tensioners for RLB Garden Tractor Chains. For chains from other manufacturers fit can not be guaranteed but here are some general guidelines: GSL-20025 4 to 6 inch tires GSL-20030 8 inch tires GSL-20032 10 inch to 15 inch tires. Packaging: 1 pair per bag Tensioners Use with GSL-20025 GTU-240 - GTU-248 GSL-20030 GTU-252, GTU-256, GTU-403, GTU-407 GSL-20032 GTU-260 - GTU-288, GTU-411 - GTU-435, GTU-505 - GTU-533