Polyurethane strips 1m long x 65mm wide x 1.5mm thick to suit Phantom 377 centreboard slot.
Can use 2-part epoxy to glue gasket to board.
After the glue is dry, use a straight edge to carefully cut the slot for centreboard.
Postage at buyers cost.
Limited quantity available.
Also works well on F2 Lightnings, and may suit other types of older raceboards with similar sized centreboard slots.