Horn button repair

Morning everyone,
I rarely post but read all the discussions on here. This site has been very helpful with my sons 77 Volare coupe.
Anyway, he picked up an 80 Volare Duster. Slant with an auto. We are going through it to put on the road, brakes tires etc. We have an issue with the horn button. Under the button theres a ring with 3 mount points thats broken. Im not sure if its complete either. Horn doesnt work. Does anyone have a diagram of the assembly?
I found that OER parts has a horn ring...

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Author: /6Volare