Photo 1 for Folbot Kayak Sponson Replacement Tube New!

I bought a vintage folbot at an estate sale it doesn’t have a tube, was it supposed to? Looking at another one also, thanks do you have any other parts?

Do you know which folbot kayak this tube is for? I know they have different lengths depending on the boat. Thanks

Is this still available and for what model and or length of sponson. Thanks