I ve been told that Zafiras and Astras should have the same gearsticks/levers (the whole assembly with gear stick/leather gaiter and gear knob) and according to the Vauxhall part catalog, this is true, except for one: The lever with the part number 93178336, which is for a petrol manual (non-F23) Zafira but NOT for the Astra, only listed for the Zafira. Why is that?? Would that fit an Astra too ?