Invacare Pronto M51 Power Chair Mar 2, 2018 | Used Rehab Inventory | 0 comments Invacare Pronto M51 powerchair 2016 model, 6 wheel on the ground stability, on board charger, U1 batteries, flat pan seat for cushion 18inx18in,4 post seat. SN)16AE000141. $850. Submit a Comment Cancel reply Your email address will not be published. Required fields are marked *Comment Name * Email * Website Save my name, email, and website in this browser for the next time I comment.