seems i remember 99-06 being the same, dont know why 98 would be any different. the instructions more than likely read hard and make you overthink the task at hand. look at the picture, then hold the backrest up where it goes and see if it makes more sense. i know when i put the quik-detach backrest on my 01 king, i had a bag of extra parts because the parts bag is universal and contained parts for the quick detach on an ultra tour pack....at least the kit i had did....