Jim, speaking from experience, some of the switches you might find thru the vendors may be a universal application and your original knob may or maynot fit. I had this problem with a wiper switch from Chevy Duty and had to return it.
Bruce Old Toy: Ol' Betsy stock 59 Apache SB Stepside (Gone but not Forgotten) New Toy: 1962 Impala SS Coupe The Driver: 1990 Toyota truck