BMW part number 18211246857 is a factory Genuine BMW Exhaust Suspension Spring. Unlike the solid metal U-bolt clamps, this part number specifically designates a heavy-duty tension spring designed to support and damp vibrations within the exhaust piping system. US 733i models may only use this for 1980 & 1981 but Euro models may apply through 1984. Check to be sure. (gar2-Y3)
- BMW E23 Chassis (Early 7-Series): Fits classic 1970s and 1980s configurations including the 728, 728i, 730, and 733i.