i have tried to find the specs on the sport rear sway bar but haven't come up with any info.
I did some checking of part numbers and all the info I come up with list the AWD rear stabilizer appears to have the same part number for all models but no listing for the Sport
here are the part numbers that I found
AWD 7T4Z 5A772 BA (this is the same part numbers for 07-09 Edge and MKX AWD)
There are several part numbers for the FWD models depending on wheel size
08, 09 FWD with 17", 18" wheels 7T4Z 5A772 A
08, 09 FWD with 20" wheels 7A1Z 5A772 AA
09 FWD 22" wheels, N.A.
MKX FWD 7A1Z 5A772 AA
The AWD appear to have the same part number
EDGE & MKX AWD 7T4Z 5A772 BA
I just checked the part number on my Sport and the number on the tag is 7A13-5A772 AA. I think you need to see if someone can get the part number off of there AWD sport to see if it may have a different bar. I am not much help since mine is FWD.