[3101-3150] Here

However, boat owners and rigging specialists are frequently issued a specific warning regarding replacement parts like spinnaker cranes:

: Parts designed for standard Catalina 27 masts often explicitly state they will not fit hulls numbered 3101–3150 . [3101-3150]

Sharing your goal will help narrow down the exact system you are referencing! However, boat owners and rigging specialists are frequently

: The Canadian manufacturers utilized a completely different mast extrusion and hardware setup during production, making standard aftermarket rigging incompatible. 🔑 2. Automotive & Hardware: Kawasaki Key Codes [3101-3150]