This is a genuine EGO Power+ 2828353001 Self-Propelled Unit. Fits Models: LM2100SP (Version A). IMPORTANT NOTE: This is an upgrade kit to change (upgrade) your Version A of LM2100SP mower to the self-propelled unit that is on version B of LM2100SP lawn mowers. EGO has discontinued the old design (Version A) self-propelled unit and it is no longer available. This kit includes everything you need to upgrade your mower to the latest version of the self-propelled unit that is on version B mowers. The upgrade kit includes new rear wheels and a new electric assembly. Please view repair guideline for additional information. If you have any questions or concerns, please contact us at support@powerplusparts.com