- Stock #403777 - VERY NICE FAMILY SKI BOAT READY FOR THE WATER! MERCURY 150HP OUTBOARD! AFT BOARDING LADDER! NICE SEATING ARRANGEMENT! WALK THROUGH TRANSOM AND MORE! This single-owner 2018 Sea Ray SPX 21 Bow-rider with a Mercury 150 outboard with low hours on it. Has a seating capacity for up to 12 people which will give you plenty of room for friends and family. Built by legendary Sea Ray boats its build quality and reputation are second to none. Starting at the back of the boat it has a nice wide swim platform which makes it easy to get on and off this boat while you're in the water. En... read more