I am no way associated with this company but a quick google turned it up.
https://www.iboats.com/Chrysler_Power_Tilt_and_Trim_Motors/dm/view_id.269938
edit: I found another post about the buying price of your new rig, I hope you can find the part cheaper then on the website I linked. Maybe see if you could have the old one rebuilt. My dad had the same motor on a trihull when I was younger as i seem to remember it always ran good and never left us stranded. There used to be a marina in Monroe Mi that sold new and used parts for Chrysler motors but I don't know the name or if they are even still in business. Hope I helped some at least.