Thirty-second is the favourite large scale for fighters, and Montex and Master sets in 1:32 reflect that with a selection as deep as quarter scale, and with Bf 109 variants taking more than half of it. The masks cover canopy glazing and national insignia, while turned Master brass replaces moulded gun and cannon muzzles. Sets are listed for the Bf 109, Spitfire and American types, always for the kit named in the set title.
Pair your chosen set with a kit from 1:32 aircraft model kits, since a mask only seats on the tooling it was cut for. How templates and brass work together in practice is explained in the Montex and Master sets overview. Markings you would rather not spray are covered by 1:32 aircraft decals.