I think Performance went to the next size up traveller car for the N5.5U by 1993. You might check with Nacra to see if you have the larger traveller car. If you don't have it, I recommend you bite the bullet and get the larger car. It makes the traveller much smoother and handles the load better, allowing it to move easily under load. I upgraded my 1988 5.5 Uni the first time I had problems getting the traveller to move easily. Also, I used a little Joy detergent in a spray bottle of water to lubricate the traveller each time I put the boat together. It sure helped make the traveller reliable and free-moving.