I m missing the Spring seat washer that goes under the spring (engine side)


I am hoping someone here could please take some photographs as well as the dimesions
Outer diameter, inner diameter and thickness
How important is the precision of this piece? I see there are 3 tabs to centre the spring (i assume) on the washer then the washer sits in a ridge on the shaft?
The whole lot turns? IE: The shaft, plate ,spring , and washer all turn the same?
I want to make one up... can i get away without the Tabs centering the spring?
Anyone got a clever idea on how to utilise a normal washer?
The part is NLA from Honda
I'm kinda stuck as its one of the last things before firing her up , so any help would be greatly appreciated
Thanks so much
Thor