Camso 4S1 Polaris RZR 1000 PRO Rear Spacer $103.95 Previous Next Part #: RZR-PRO-1000-S The rzr 1000 pro rear spacer are custom mounting parts for 2021 Camso 4S1 track systems. These custom mounting parts specifically apply to Polaris UTV models. We offer the best parts and expertise for any UTV track application. Go far. Explore more. Reviews No reviews written.