There was 1 bolt & 1 nut missing from the mounting hardware.  I replaced them with used ones.

*【 OEM Standard】Boat trim actuator is perfectly fit for lenco15054-001 and 20400-001 OEM parts.The 15054-001 actuator is 101 standard and features a 2.25-inch Stroke, 5/16" mounting hardware,6-foot cable and mounting hardware,which meet or exceeds OEM standards.
* 【Prefect Precision】15054-001 trim tabs made with precision high alloy gears, molded brass thrust bearings, 12 ball bearings at each end of the stroke that are free to rotate, a ball screw that automatically locks into place without shifting, and twice the power of ordinary hydraulics, the 12V high-torque actuator motors can easily push items weighing up to 500 pounds.
* 【 Waterproof and Durable】Design including double O-rings and over-molded cables with waterproof "Plug and Play" Deutsch connectors to eliminate the possibility of water ingress. In addition, its housing is made of nylon 66, 50% glass fiber reinforced thermoplastic for high impact, UV , and corrosion resistance.
* 【Easy to Use】15054-001 trim tab actuator is "plug and play", you can replace the old actuator in 5-10 minutes and easily enjoy your leisure time!