W124 300d 1990 Idler arm bolt

[Murkybenz]

I am going to replace my idler arm bushings due to low speed sway + creaking.
Awaiting delivery of the bushes.
I have the bolt and washers.
The bolt has the top washer fixed to the bolt head and is not central as per most diagrams or pictures I have seen of them.
Washer is offset to one side top and bottom ?.
Is this an upgraded part designed to spread load and flex ?.