@ian- you don't have a future fin system do you (has one screw at the back of the fin to screw the fin in to the fin-slot)?
Take a quick google for this fin system and check. If so, futures fins are common and finding replacement fins will be easy.
I did a search and found this article where someone else mentions the same problem that you have in finding this 'EFEX' system. In that case, I have no idea what they look like or how to find / fix a different fin to it sorry.
http://www.surfinghandbook.com/surfboar ... tem-guide/@954worldexplorer- I've only been surfing a year but started playing around with fins when I moved down to a shortboard after about 4 months. Luckily enough a few different boards I brought had different fins so I got to play around with them just by chance or I probably wouldn't have ever moved away from the stock fcs m5's. A lot of people can't pick up the difference between changing fins but I noticed a huge difference to how they handled, gripped and picked up speed.
I would probably wait at least 6-12 months before you have an idea of what your surfing needs from your fins ie. more drive, more flex, more release from the fins etc and then start playing around and see what makes the biggest positive impact. Would i pay full price for the latest fins? No, but i looked around for second hand (but good quality) fins that people were trying getting rid of so at least if I didn't like them I could then re-sell them. I found more difference in the shapes and templates of fins rather than the construction so much. I still find the fcs K-3 plastic fins had about as much drive and release as any honecomb fins or other templates I've tried.
I also waited for specials on websites like
www.surfstitch.com and ended up getting a carbon-stealth shapers fin set for only $56 at Xmas. You can't even get genuine plastic replacement FCS fins for that here!
I straight away felt the speed and responsiveness of these new fins over that stock plastic fins but didn't find they had enough drive on the side fins for my board. I flicked them off for $70 which then paid for a different set that i really do like (carbon-wrapped honeycomb construction).