This is a high-quality afforable replacement for C34284 starters used on Briggs and Stratton Vanguard Equipped Tractors. 3012, 3014, 3016, 3018, 4016, 4018, and others. This is the starter you need IF YOURS HAS A "PLASTIC" starter gear and an aluminum ring gear.  CLICK HERE for OEM Nylon Gear Starter.    
This is the wrong starter if you have steel gears.  We do offer the steel gear starters Aftermarket and OEM starter
 
We highly recommend replacing your key switch and solenoid at the same time to protect your new starter and to make sure your starting issues are fixed by replacing all the major components of your starting system. We offer the options to do so at check out and have info on these products on our store pages.