I have a Mirage Hobby kit of the 'M3 Grant'. Included are optional long-barrelled and short-barrelled 75mm guns. Would these have been specific to particular versions of the Grant? Also, the tracks appear to be rubber-block treads, but I have read that the Grants used in North Africa would have been fitted with all-steel tracks (often referred to as 'double E' pattern). As I have a fairly sizeable collection of unmade kits, I wonder whether a suitable set of tracks may be lurking in a box somewhere ... just a thought.