Re: 73 Johnson power trim
Power tilt/trim was probably not offered as factory installed in 1973, so it was sold that year as an accessory. If you go to the factory parts listing website, you will find the trim assembly sold as 172509. It's in the electrical accessories section. This particular assembly has been NLA for many, many years from the factory. Interestingly enough, two Bombardier dealers currently show stock on this part: Van's Sport Center in Grand Rapids, Mi

616) 364-0666 and Marshall's Marine in South Carolina: 843- 394-1000. Would be interesting to know if they are new, in the original box. I do not know why the purple icon was added to my posting.