Which HVAC valve do I need for 211 E55 2003

[rsv clk]

I have tried to order a new HVAC valve but without stripping it down it says that if it has a night or rest heater I got a A2118320584 and not sure whether or not it is the right one.
I am sure some else has had the same problem that could point me in the right direction

thanks Guys and Girls