Part of keeping the 4788 running well is to regularly replace certain items, and to keep some spares on board. Your 4788 may vary depending on the year, or modifications. This is my list of parts to regularly replace and keep spares.
Safety
Safety items are usually the highest priority to have on board.
Flares: http://www.westmarine.com/buy/orion–coastal-alert-locate-flare-kit–14994487?recordNum=20
Fuel Delivery
Main engines fuel filters (x2): https://www.amazon.com/gp/product/B000N9L278
Generator fuel filter: https://www.amazon.com/3123-NAPA-Gold-Fuel-Filter/dp/B00K24I0P6
Webasto diesel furnace fuel filter:
Comfort
Voker holding tank filter. This keeps the holding tank smell in the holding tank. https://www.amazon.com/gp/product/B00E533IE8
Other
Windshield Wipers – Bosch Automotive Clear Advantage 28CA Wiper Blade – 28″