Mulfab have the strengthening washes welded on. Lots don't seem to now and for some reason seem to have a slotted hole one end?
I like having that fitment at the oiler bolt end, I also round the flattened end corners following the radius of the washer being carful not to encroach on the weld or washer. On the chassis end I relieve the inside corner to allow the fixing to be made fairly close to the vertical chassis frame and a small radius on the outer corner to make it friendly when working on the car!
