I originally upgraded to these bilstein shocks over the stock ones on my 2000 E-350 Quigley in late 2010. They have 10-15K miles on them and are the ones recommended by Bilstein for the Quigley. My van has the older C-Channel front arms and these shocks fit those for sure. Not sure if they fit or not if you have the updated arms from Quigley. The yellow rears are in excellent shape and the silver 5100 fronts are in good shape. The fronts do not have the boots on them and as the photos show the stickers are coming off a bit. Also can't seem to find the nut for the top of one.
These make a great improvement over the stock shocks. I opted to upgrade to the reservoir Bilsteins in front that were not available when I originally bought the shocks. In the rear I had BajaSportsmobile (Ramsey) custom valve a pair of his Fox shocks to work better with my airbag setup by providing more rebound damping.
I thought about keeping these as spares for the trail but decided to just sell them.
Dropping price to $115 plus shipping.