Have you looked up the part(s) number? “Tilt and trim unit” covers a lot of ground.
If the unit is leaking down, have you verified that rebuilding is not an option?
There are a number of new/used parts places on the net that I’ve had great luck with. I’ve also found lots of parts on eBay, but you need to know the exact part numbers and do multiple searches to cover different possible formats.
Little more info and I can probably point you in the right direction. IMO, if the unit is letting down and a rebuild is possible, I’d think about that route because then you know what you’re getting.
Grouse