Who makes sliding seat bases for high back bolsters????

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Answer: Garelick/Eez-In...Model # 75080(slides 6") or...Model # 75081(slides 7 1/2"). They are low-profile at only 1 5/8" high & are a strong aluminum extrusion material. Would recommend the longer 7 1/2" slide assembly. Through-bolt the slide as well as any fabricated base you might build & bolt it to. Used these on all the Velocity, Apache, Powerplay, etc...sit-down bolster seat boats that we built. Hope this helps. Ed