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If you are talking about caps on the top of the rod holders I don’t have a suggestion. If you are talking about the caps on the bottom T-H Marine has universal ones that slip on the bottom with a 3/8” drain hose on them. The only rod holders on my boat that had drains from the factory were the forward ones, the rest drained into the storage compartments, I got the T-H marine ones mentioned above and then routed the drains so they all dump overboard.