If you go to gmcs website it says the slt1s get a chrome luggage rack,
FWD 4dr SLT-1 MSRP $27,750 Hide Details
Same as [FWD 4dr SLE-1] Plus:
Air conditioning, single-zone automatic climate control
Audio System AM/FM/XM stereo with CD player and MP3/WMA playback capability, Graphic Interface Display, Radio Data System, auxiliary jack input, speed-compensated volume, USB port receptacle and outside temperature display. Standard on SLT-1.
Audio system feature Pioneer premium 8-speaker system with subwoofer and amplifier
Bluetooth for phone personal cell phone connectivity to vehicle audio system and HMI (Human Machine Interface)
Engine 2.4L I-4 SIDI (Spark Ignition Direct Injection) with VVT (Variable Valve Timing), (182 hp @ 6200 rpm, 174 lb-ft @ 5100 rpm). Standard on SLT-1.
Luggage rails, chrome
Remote vehicle start includes extended range Remote Keyless Entry
Seat adjuster, driver 8-way power with manual fore/aft and power lumbar adjuster
Seating Perforated leather-appointed with heated front bucket seats. Standard on SLT-1.
Seats, heated driver and front passenger
Steering wheel, leather-wrapped with mounted audio and cruise controls
Tires, P235/55R18 all-season, blackwall (STD)
Transmission 6-speed automatic. Standard on SLT-1.
Wheels 18" bright machined aluminum with P235/60R18 all-season, blackwall tires. Standard on SLT-1.
but this is straight off the gmcs website I must have not done my research