This kit includes both the tall and short front differential pinion bushings for your older model Polaris UTV. The tall bushing measures 18mm OD x 16mm x ID x 15mm H, while the shorter bushing measures 18mm OD x 16mm ID x 12mm H. This kit includes both tall and short bushings, as your machine will use one or the other. This kit makes sure you get the correct bushing.