Malibu/Axis First Gen Riser This seat base will replace your original platform with this one that is 4 inches taller. The seat base was formed, and then CNC machined and powder coated for a durable finish and a great look. It is a simple bolt-on part that is easy to install using the original hardware. Malibu/Axis Second Gen RiserDriver's seat risers for Malibu boats, Adjustable from 3 3/8 To 4 7/8.. Comes with all stainless hardware for durable, corrosion-resistant mounting Easy to install with included instructions; basic tools required Each riser includes a vinyl or decal sticker (Malibu or Axis) to personalize your setup Constructed in the USA with high-quality materials for long-lasting performance