I've been trying to order the F-250 shock mounts but several dealerships tell me the part number posted on the website is wrong. They say the part # E5TZ-18183-A is not for a 1980 F-250, part # E2TZ.... is! What piece of information is wrong? The 1980 F-250 or the part #? Which part # is used on the ColoradoK-5 Blazer for the RS 9012s? Anybody have any idea?