Just installed an STB from the Malibu SS and it fits 99.9% perfect. I ordered the factory GM part from GMPARTSDIRECT.COM and it took about three weeks but it is here. I installed it on a 2006 g6 gtp convert. I no longer have pronounced cowl shake, excess body lean, or the pesky rattle in the front of the dash. This car handles like it is on rails. 2 nuts 13mm per side and bam its done. On the hood where the highest point of angle for the brace meets the closed hood, place a piece of double sided tape to keep the hood from getting 1" rub marks. You will see it. 96.28 shipped, the best upgrade anyone can do for a car.