I'm going nuts trying to source these neat looking full-helmet pilot figures/heads (below)? Can anybody pop with a source for various scales? (The helmet shown is actually included in the Hangar 9 Sundowner Formula 1 ARF as ashown [where I swiped the pix] and I'm hoping the Hangar 9 folks might have them available as a spare part".) I'm thinking the scale I'm interested in would be 1/4 or 1/5. Thanks for any clues.

Mike