manual says to contact dealership, everyone is quoting me over $800 to replace this bulb.
2006 cadillac srx, low beam headlamp needs to be replaced on 2006 Cadillac SRX
go to a junkyard or call a junkyard, they may have one. it will save you a lot of money. if that do not work, get on ebay or discount auto part for the make and model of your car. any you want is wright at your finger tip, your computer. sometime it may take a while on your computer to find it , but you will find it. good luck.
If you have HIDs then it's over $550.00. Regular bulb replacement is 1.5 hours of labor and $35.00 for the bulb. Good luck.