I have a 1989 75hp Mariner 3cyl OC170850 that has a deteriorating lower mount/ yoke. It has a lot of play in it, can move engine a good 1/2" forward/backward at the lower mount. I need to replace the bolts and hardware to the lower mount (yoke). Part# is 42930A 1. Does anyone know what is included in this kit? Are 2 kits required for the lower mount. The sizes available are long vs. x-long. I am assuming I need long, 20". ANyway to tell if i actually have x-long based on serial # of motor? Thanks in advance.