Installed the mustache bar without the offset washers. Seems to line up well. 

9 hours ago, Yarb said:

Thanks, What do you think about the slanted off set washers that come in the kit. I was told by Whitehead they are used for leveling. OEM doesn’t require them. Just wanted a bar to bolt on and put my rebuilt suspension back together. The other concern is once it’s installed it’s mine.

I have never used slanted washers but they are a good way to help align the nose of the diff for pinion angles, on modified cars with different engine/transmission combos sometimes you need that adjustability .