FCS II or Futures to longboard fin box adapter - white or black

Description

Use your Futures or FCS II fins in a standard longboard fin box. Ride your mid or longboard as a thruster or twin+1.
revised design improved fitment
successfully used in Hawaiian 4-8' swells
Now available to adapt FCS II and Futures fins
FCS II adapter fits fin up to 5.25" long.
Fin is "locked in" once adapter is installed in board.
Install fin in adapter prior to installing in board. Tilt up adapter once installed to remove fin.
Futures adapter fits center
and rear quad fins with a 1/2" Futures fin base. Includes futures screw.
Both versions available in white or black.
Printed in PETG on a Bambu Labs 3D printer
Longboard fin screw and plate not included
Choose the correct base to match your board
This site contains a good explanation about the two different longboard fin boxes
Which SUP Fin Base Option Do You Need for Your Paddle Board? (blackprojectsup.com)
Longboard (Fins Unlimited):
If your fin box says
Futures Fins ILT made in Huntington Beach, FCS or Fins Unlimited Encinitas on the inside bottom then choose the Longboard (Fins Unlimited) version -
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imensions: 168mm long x 21.5mm high x 9.2 mm wide
US Box:
use if your board takes the larger longboard fins with the hump on the base. This fin base is more common on non-USA made boards.
168mm long x 24mm high x 9.2mm wide overall
Sold by DISTEL3D LLC. Use at your own risk.