mystery cylinder spacers

[Turin]

Head scratcher...Found these in my pile, can't remember why, what, etc. Looks like squarefin 1100. What did these come from?

[guzzisteve]

Could it be for a 82mm crank?

[Frenchfrog]

Looks like some aluminum spacers for lowering the compression...like these from HMB?
https://hmb-moto.de/Cylinder-Spacer-for-square-engines

[Turin]

2.06mm thick. They would work to drop compression. I don't know why I would have them. 

[bigbikerrick]

My 73 eldorado had those installed between the barrell,and base gasket. Oiginal owner said they were popular with the low octane gas in the early 70s to avoid pinging. I still have a set somewhere in my parts stash.
Rick.

[TOMB]

I have a set brand new never installed.
Not sure what they fit but the default is Ambo or Eldo or T3
It would be a stretch but maybe G5 Convert

TOMB

[guzzisteve]

I sold a set or 2 to a forum member last year or 2. They were thinner than yours and for an Eldo or Ambo for decreasing compression. Old stuff Harpers used to sell, I think that's where they came from.