Check here: https://forum.tinboats.net/viewtopic.php?f=3&t=47496 ,as you might find your model# listed there. I just used this list the other day when I found the model# for a 1969 vintage hull. I had to wade through a ton of PDF files and manually search for it ... but I found it!
Now, what 'I have done before' if I can't find the exact model# (as that listing may be incomplete for the years), is that I check the measurements of my hull against the specs listed in the file and I pick the closet one. Doing so I have never myself had any issues when getting a State registration.