Grimeca rear Drum actuating arm

[Shajota]

Anyone have an actuating arm to fit the 200mm Grimeca drum as fitted to the rear of early GTs which they would be willing to sell?
I believe it is the same as the arms used on the front brake (1st series Grimeca) but may be wrong.
Attached is pic of arm I need to avoid confusion in terminology. Thanks for any help.

 

[Normski]

Unfortunately I don’t have one of these spare.
I’d like an arm for the smooth brakeplate which has a larger diameter splined shaft if anyone has one spare?