Well I'm just puzzled as what a Mark 7 is as it is often referred to? You tell me your 5 has the Zetec then my little theory is shot down! The Wiki site lists 1,2,3,4,5,5b and 6 (ie no 5a)? I think some folk refer to the 5b as a 6 and therefore the last version is a 7.
Rodney