I need a new shifter cable for my 1992 Rockwood

Take it out and go to your local boat shop and they can make you one. Call some before you run to them. If not look on-line. Have replace many that was made to fit. You also have some good RV places around you and just a tad North of Houston.

Just called a friend at the auto parts store and they have kits, that you make by adding a end. You must have your old one in hand to get the right length. Do not lose your fitting since you most likely will re-use them.