For the TFSI engine G is the latest - it ran A-G. The "D" revision that people have used is actually from the TSI engine but still works on ours
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To answer your question, the G is the latest and at the moment, the best OEM DV you can buy
There was a revised D model with a diaphragm, but tbh you can't go wrong with a G. If you car was a late 2007 or later it probably has the G anyway