I got a hose that's starting to fray and I figure it is probably best to replace all 4 hoses rather than having them blow out on me. My issue is I can't figure out which ones I need from iboats. It is a 88 Maxim with a 5.0 alpha one drive.
These links may help you a bit as it seems you need to get the OEM part number then look on the IBOATS link and scroll to where you find that OEM part number.
Then looking at the IBOATS page: Mercruiser Power Trim Hoses - iboats
scroll down for either the Sierra or Mallory choices and there are some descriptions on what they fit and the OEM part number.