I only had one size of rings in my kit. Didnt pay attention to the sizes on the plan. I glued the ones i had in centrally over the holes in the fuz for the locating Alu dowels.
On the main diagram they are shown as 3mm ply rings, on the close up diagram they are shown as 2mm ply rings and in the parts check list they are shown as 2mm ply rings. I only had one set, so it's possibly a typo.
What you putting upfront in your Leo?

Cheers, D