Premium Quality Replacement PartFork Caster Roller BearingsFor Simplicity Models:1600199 – Simplicity 48″ Rotary Tiller Attachment48″ Rotary Tiller-Drive Group1690989 – Simplicity 38″ Tiller Attachment38″ Tiller – Durst Gear Box1690982 – Simplicity 42″ Snow Thrower AttachmentRight Angle Gear Box – Durst1690984 – Simplicity 60″ Mower Deck42″, 48″ & 60″ Mower, Drive Assy. (Curtis Gear Box)1690986 – Simplicity 48″ Mower Deck42″, 48″ & 60″ Mower, Drive Assy. (Curtis Gear Box)1691009 – Simplicity 42″ Mower Deck42″, 48″ & 60″ Mower, Drive Assy. (Curtis Gear Box)1691167 – Simplicity SunStar 48″ Garden Tractor, 20hp42″, 48″ & 60″ Mower, Drive Assy. (Curtis Gear Box)1691168 – Simplicity SunStar 48″ Garden Tractor, 18hp42″, 48″ & 60″ Mower, Drive Assy. (Curtis Gear Box)1691182 – Simplicity 42″ Mower Deck42″, 48″ & 60″ Mower, Drive Assy. (Curtis Gear Box)1691183 – Simplicity 48″ Mower Deck42″, 48″ & 60″ Mower, Drive Assy. (Curtis Gear Box)1691184 – Simplicity 60″ Mower Deck42″, 48″ & 60″ Mower, D