Found this ebay listing with dead stock fiberglass YU sets:
Bought a clear set. Looks like only blue and red left.
Futures Fiberglass Tri Fin Set FYU | eBay
Traditional Futures foil. Base: Side fins 3/4" depth Trailer fin 1/2" depth.
www.ebay.com
Bought a clear set. Looks like only blue and red left.