This is a brand new GM P/N 15110022 Chevrolet SSR Hitch Insert Ball Mount.
The original manufacturer (Oris) still builds them under GM license. This hitch is rated (by GM) at 2500lbs and a tongue weight of 250lbs.
Designed specifically by Oris for the Chevy SSR, it does not interfere with the rear fascia.
Shipping weight of this hitch insert is 14 pounds, so it is shipped separately in a USPS Priority Flat Rate box.