I did put one washer in there, not to sure where it came from since it was in a bucket-O-bolts I aquired over the years but it was a washer that fit. Not to sure if it is even needed and may be fine with out, I didn't try.

The bar was on a list that I got from a mercedes forum which was not included on maxcichon list from Speedwaymotors. Just bought everything from one place, one shipping bill, one package, keeping things simple. Holding up good so far even with a few scary moments on road or off.

I'm not trying to save weight back there, I got some junk in the trunk weighing it down already.
If I want to lighten up the car I should start with the driver.