Ahhhh... Gotcha. Sorry about that.
I did take out the 17mm hub on my newer Revo to try the T-Maxx chevron tire that required (I believe) a 12mm hub.
Like you, I was looking for an adapter to be able to keep my 17mm hub and pop something on to use those Maxx chevron tires and couldn't find...
Looking at the Traxxas exploded views of the current Revo 3.3
Confirming that you have the 5451X/5451R driveshafts, correct?
If so, the conversion to the 17mm hubs is pretty easy. You can just buy the 5353X 17mm wheel hubs. When removing your old 14mm hubs, it should be held in with a pin...