I am refurbishing a couple of boards to be loaners, trouble with new ish wave boards is the cost of fin sets.
Even secondhand ones. When they are destined to be rarely used, or used by others, I'm not gonna stick a $200 set in...and buy 3 sets.....

Anyway so I am chasing damaged quad sets, predominantly the main fins as they are the ones that smack the rocks..... or yes, in my case the garage roof

Preference for 13-15cm fins in slot or US box, but will consider whole quad sets and other bases as I can rebox them

Cheap is main idea......