a copy of what ? reading the carbon website, they are a new design, no copy intimated, and they include a gearbox breather hose.
It seems that nobody under 60 appreciates my cutting wit.
You know back in pre computer times and printer or copier times there used to be a copy made of what was typed or written by placing a sheet of carbon paper under the sheet typed.
These were known as "carbon copies"
Regards PhilipA