There is a 91-97 YJ and TJ towing kit. You need that one, it plugs into your factory weatherpack plugs. You could splice on the 98+ plugs if you found them, but they are designed for all the wiring to be tapped into at the right tail light. 97 doesn’t have the left turn/brake signal at the right side plug, so it wouldn’t work anyways unless you tapped into the left side and ran a wire over.