I just asked my dealer and there is no way to split the upper and mid spoilers you buy one you get both. I have a 04 Fusion and to get it in, painted and attached was going to easily be a $1000.00. I am currently searching for other options. Good luck. I could spend that grand on engine upgrades and big wheels.
You can buy them seperately. I bought my upper spoiler by itself. I bought i primered for around 300... I can't remember. The part number for the upper is 12498397 and lower is 12498398. I think you can get them from gmpartsdirect.com