CT Raceworx Polaris Pro-R Differential BracketsSKU: CT POL 1500 1 These are upgraded rear diff brackets for the Polaris Pro R The factory diff brackets are thin and can't handle the full time stress of stock power and stock tires. Add a tune, bigger tires and some tough trails and they don't stand a chance. That's where we come in. These brackets are built from . 125" Grade 50 Structural Steel. We didn't just mimic the factory brackets with thicker material, we added gusseting for more rigidity