Do you want ones to stick on the tubes, or holders to fix to the deck?
You can get velcro straps that have a screw-on attachement to hold them to a surface. Can't find a pic right now, but I got some in B&Q a while ago.
Might be cheaper to buy a length of velcro fastening strap (hook one side, loop the other) and source your own screw-on fittings.
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