The Amazon catalog says that this doesn't fit my 2004 E500, but it does. In fact, it is absolutely-identical to the A.I.R. pump I pulled from my engine two days ago. This is one of the easiest DIY jobs on the car, so there's no reason to pay $1200 at the dealer. Buy this Original Equipment Bosch pump and do it yourself in 5 minutes. Unplug the power connector, undo one Torx bolt, detach one hose from the pump, hit the bracket with a screwdriver so the front drops away, remove the pump, slide the rubber bushing off the old pump, slide it onto the new pump, put the new pump in, close the bracket, screw it tight, reconnect the hose, reconnect the power, and it's done. Literally took me 5 minutes.To determine if this is the right pump for your car, check what part numbers interchange with the one on your car, and if 058 0000 010 comes up in the interchange table, this is it. It is literally the very same part as the Bosch part that Mercedes installed on my car when they built it. Not similar. The same. And you can't beat the Amazon price. I checked all the major discount online parts suppliers (some of whom said this was the right part, by the way), and nobody beat Amazon. And of course nobody can beat the Prime shipping!!