I don`t know the part #, but the bar came on the mid 80`s IROC & Z28 Camaros. Both sizes:34mm & 36mm. Moog makes bushings that will fit. I have one on my car, 12 lbs. lighter that stock. Go to the GM dealer & give them that info. If you can`t find a new one, I sell used ones for $65.00 plus shipping.