Been putting together a 2006 185 Sport for about a year and it's just about ready for a trial run but the twin rear lower seat cushions don't seem quite right. All the upholstery has been redone and it looks great but it seems like the twin cushions that make up the bench seat just sit on the bench and seem to slide around pretty easily. Does anyone else have a similar boat and like to hear if their cushions are fastened down or if that's how it's designed. Just seems like they should be restrained since they move around pretty easily. Thanks!