I've had a couple silver LGT spottings in the past week. One debadged specB w/ wing (assumed specb by wheels, too dark to confirm color) from Palatine all the way to about the 90 exit on 53 SB.
The other was a silver debadged LGT with what looked to be 3.0R wheels at Shoemaker rd to 59 NB getting onto 90 EB, then exiting onto 53 SB.
Could have been the same car with winter wheels?