eBay Picture Doesn't Copy...
Different, but this looks like it would work. It's pictured 7 times sliding down on 4x4 wood dock posts, so it's even moveable:
Portable Boat Bumper Dock Cushion Protector Fender
$64.00 · eBay - whiskeycreektrading
+$6.15 tax and $18.00 shipping
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