Mk2a carbs need a MK2a airbox...Look on EBay or somewhere for a pic of the airbox end of the carbs MK2a has something like a 10mm ring around the carb houseing about four carb jets, they will not fit into a 3vd or MK2 airbox.Mk2 carbs from memory will fit a 3vd airbox.
Bjorge was talking MK2a the term 4TX is a bit vague.
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Mk2a carbs (with diaphram pump) on my 3VD gives more poke than MK2 carbs which in turn gives more poke than 3VD carbs.
