A-B15047027SM-AI SPACER, .51 X .75 X .One New Aftermarket Replacement Spacer Fits Ferris, Snapper, and Simplicity Lawn Mowers This deck wheel spacer is used on the mowing deck of Fits Ferris zero turn and stand on mowers, as well as compatible Snapper and Simplicity machines. It positions and retains the deck gauge roller wheels, allowing for precise cutting height adjustment and protecting the deck from uneven terrain. Specifications Dimensions: . 51" (ID) x . 75" (OD) x . 56" (length)