Back seat seatbelts
Is the there a way to put in seatbelts in 65 Catalina
so my 6yr daughter can ride in car?
Of course. You can install lap belts or 3 point. https://www.seatbeltsplus.com/
And this site. https://www.retrobelt.com/
If you're concerned about legal issues, don't be. Your Catalina was made before July 1, 1966 so it is not required to have seatbelts. Your Daughter can legally ride in the back seat of the car without them. Hope that helps! Jim