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Two externally mounted insert sleeves to bridge a 9 1/4" feed slot.
The long piece should be permanently mounted (glue, nylon rivets or screws) because the shorter 2-inch piece will be removed to add or remove sail slugs. It will also be less costly to buy an extra or replacement short piece.
White durable nylon is the least costly. The dyed colors or skin deep. Black is best for UV protection and Orange is best for sailing schools to direct new sailors to a reference point.