I ordered a set of Bilstein OEM replacement HD shocks from ORW then decided to install a level kit on my truck so I returned the OEM replacements for a swap for the 5100 series. The OEM Bilstein front replacement shocks came with a large one piece rubber bushing (hour glass shaped) with a metal sleeve. The new 5100 series fronts that I just received have 2 piece rubber bushings with the large metal compression washers. Which is correct?