Freightliner parts

Hi guys can someone tell me how I can find parts for my freightliner Coronado, I have a 2003 model and when I search for toggle switches for the cruise control and jake it keeps throwing me to a Columbia or Cascadia are these backwards compatible, what I mean is will they work and have the same wiring they look the same but I want to make sure it's just a simple plug and go, and yes I know I can go to a freightliner dealership but they are marked way up and I'm just a starving truck driver looking for a cheaper price.

 

Yeah I had to buy an interrupt switch and they charged 54 dollars for it, it's the same for the others, I have found them online for 12 bucks but it said they are for 2001 to 2009 Columbia and Cascadia so it didn't know if they would work in my 2003 Coronado.