These 2 companies are the leading brands in the market today for surfboard fin systems
At present there are 3 main fin systems (fin boxes) that can be selected when purchasing a new custom surfboard.
They are FCS, FCS II and Futures fin systems (fin boxes).
fin boxes will only accommodate fins with the FCS or FCS II fin
FCS II Compatibility kits can be purchased to ensure that your older model FCS fins can be used in the new FCS II fin
boxes will also only accommodate fins with the Futures fin
Most Surfboard Brands
will offer the choice of both the FCS and Futures fin systems
Be sure to select your preferred system and make sure you order a new set of Surfboard Fins
to go with your custom surfboard.