I'm trying to replace the directional switch but I cannot remove the upper cover (where the switch is located). According to the the 1968 Buick Service manual (section 90-58 paragraph 4), you need to remove the upper steering column cover (the one that has the hazard warning switch, signal and tilt release levers). The manual references a special tool J-225989 to remove the cover but I cannot find one anywhere => I tried a wheel puller with the arms reversed to pull the cover off but it does not work - I stop using the puller when the inside lip of the cover started to turn outward. Has anyone ever replaced a 68 Riviera directional switch or where I can purchase that tool?