I have a non heated 2003 comfort seats. I found a 2005 set of HEATED comfort seats locally. I have a spare SZM.
Will this be plug and play? In not, what should I do to get bun warmers for wife’s X5. Least amount of wiring is my first choice.

__________________
2003 4.6is X5
2003 525it
2003 E53 X5 Standard shift