Re: Stringer Hydraulic Trim Rebuild
all the seals are available from any Evinrude dealer. They don't have kits, but the individual parts are available. shop.evinrude.com - go to parts, then dropdown the menu to sterndrive and you should be able to look up all part numbers.
years ago, I crossed the parts at a hydraulic seal place (Hercules in Barrie, ON), and I made up some kits and sold them on eBay, but the savings weren't enough to warrant all the work to cross reference for one boat. They were a pain to deal with too - not set up for dealing with individual customers.
dealing with people on eBay was worse, so I quit making the kits up. I think it's around $140 for all the seals from BRP (Evinrude)