Hi Larry,
The Bilstein B8 6112 Suspension Leveling Kit does require use of some original factory parts. The top spring mount is re-used with the new shocks and coil springs included with this kit.
Here is a link to the instructions for this kit that will explain further.
https://productdesk.cart.bilsteinus.com/media/products/bilstein/E4-WM5-Y504A00_3.pdf
The instructions will also be available on our website very soon