I have a pair of new (old stock) fins for a Naiad 353 stabilizer system, still in crate, that I need to unload. The story here is that I bought these from a seller who is not in the business and could not tell me the model or part number, only the exterior dimensions. I have 7.5' fins and have been looking to trade up, so I bought them sight-unseen. Sadly, my system is a 252 which has smaller shafts. These fins are for the larger 300 series actuators. So my folly can be your gain. I have $5k in them but I am willing to let them go for less to cut my losses. They are sitting at Stabilized Marine in Fort Lauderdale who would be happy to install them for you, or I can ship them truck freight at your cost. For planning purposes, I paid about $400 to have them shipped from Los Angeles. Email me if interested or you can also call or text me on four-zero-eight 892-6227. -Sean m/y Vector Under way on the Okeechobee