Need advice: Did shop install wrong part?

I lost the passenger side air dam to some road debris and took my car to the local dealer for a replacement. Ater some confusion and delay concerning the correct part number, the dealer finally called to say that the part arrived.
When I got it back, it appears that both air dams have been replaced and they now have squared corners (inside and out).


When I feel behind the inside edge of each unit, there seems to be a ridge (channel) that might be intended to match up with the center air dam on a non-Z51 model. I much preferred the earlier design both for aesthetics and because it now scrapes in locations where it didn't before.
I suspect that the dealer incorrectly ordered the two side pieces of the non-Z51 air dam. I do recall hearing something about the Z51 air dam design being changed after initial production, but have no further information.
I thought I would seek out the wisdom of my CF brothers before taking the dealer to task on this.
One would assume that they were made aware of their mistake when they saw the shape and dimensions of the remaining original air dam. Moreover, when I picked up the car they neglected to mention that both sides had been replaced.
A suspicious mind would conclude that they just slapped on what they had, believing that I wouldn't know the difference.
Last edited by Magister Ludi; Apr 21, 2014 at 11:59 AM.
One would assume that they were made aware of their mistake when they saw the shape and dimensions of the remaining original air dam. Moreover, when I picked up the car they neglected to mention that both sides had been replaced.
A suspicious mind would conclude that they just slapped on what they had, believing that I wouldn't know the difference.
If it was a high volume dealer than yes maybe they tried to deceive u.
When I had my m3 I had a huge fight with service (maint. included) that my m3 had a special TSB for rear diff fluid break in change and they didn't know that until I printed it and showed them.
One would assume that they were made aware of their mistake when they saw the shape and dimensions of the remaining original air dam. Moreover, when I picked up the car they neglected to mention that both sides had been replaced.
A suspicious mind would conclude that they just slapped on what they had, believing that I wouldn't know the difference.
I thought I read somewhere that they might have changed the airdam design?
Of course the parts listings are still not available on the Internet from OEM GM parts suppliers so there's not way to check.
Those are wrong, they had a 50/50 chance to get it right, they failed.
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Here's a photo that shows mine:
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Thank you very much. That's what I needed to know.























