Just go with Beru or get the MB wires, which while a bit more expensive, will be of the proper length and have a nice sheath around all of the wires to keep them together. Generic wire sets (even OEM) tend to be of one length and can be messy underhood.

The best deal on factory wires is going to be through parts.com (get the part number first through the MB EPC).

Cheers,
Gerry