Write your question here...Did they ever...
Write your question here...Did they ever make the rd 7900 GS derailleur? It is listed on the Shimano site.
While Shimano did make a GS version of the 7900 rear derailleur it was not widely distributed. As demand for triple fronts wanes there will be far less availability for such a long caged derailleur on the market. There may be a chance you could locate one but I have checked with a few vendors and no one seems to stock them.