Sponson trim tabs are specifically designed for cat applications. The 2 1/4" mounting flange is designed to fit in the rear transom notch. Each kit includes one pair of tabs, two pumps with billet mounting plates, stainless braided lines, exterior bulkhead plates, and a billet knob style dash switch. SP1600 tabs are 12" wide and 28" long. DMP's patented billet hinge design and the 1/2" thick billet construction make these tabs ideal for any high performance application.