Europa-List: Missing bits

[Fergus Kyle <VE3LVO@rac.ca>]

Cheers,
        This involves the Rotax 914 ancillary bits for a Classic mono:
I am in the process of offering up the engine to the firewall intially to 
give me an idea of where some controls etc. will poke through.
In the process, I have instructions to mount the Turbo Control Unit 
on the rear face of the firewall, utilising "SAC1196C10 Tinnerman washers" 
of which I have none (kit bought from previous company.
 Nor can I find same in AirSpruce, Wicks or any other catalogue.
What are they, please?
Ferg