Found them, they're from a Matchbox Mirage IIIC sheet.
The blue is not as deep as in the picture above, more medium-ish, but there are six of them, plus the french stuff.
As for fin flashes there are two big'uns in the colours for FAF and SAAF that I think is meant to cover the rudder and have text on them, "Avions Dassault Mirage IIIC N° 56" and "Avions Dassault Mirage IIIC N° 800" respectively.
Anyhow, if the cap'n don't sort you out......drop me a line.