What fins were originally installed and how can i replace them

i just got this old infinity tandem? board … the side fins are full boxes and had no fins in them … anyone know what the original fins were and can they be gotten or what fins i should use in place of them … i see where i can get an FCS adapter that will go in the original side fin boxes … be cool to surf this how it was built


Look for an old set of 80s era Rainbow twin fins. Good luck. I’d just ride it as is. Those side bites won’t make much of a difference anyway.

the vee in the tail is huge? i was thinking the vee was so accented because of the side fins though? going to go either way but was just wondering if anyone knew … thanks for your time and input!!

Rainbow twin fins of the era is the answer.

you have some for sale? or any suggestions?

Ebay, SurfSwap on FB
Where you at?
The Vintage Surf Collectors Club (formerly Long Board Collectors Club) has their big meet next month (Saturday Dec. 2) at Doheny.
Good chance of find them at that event.

Your best bet is probably to contact Rainbow Fin Company directly and tell them what you need or find someone here who makes fins to make you what you need.