Bill I'd send you the ones from my Revell kit - but alas there aren't any there either
All the reference photos I could find clearly show the tanks as a pretty much standard addition for the G4, so it seems strange that Dragon would omit them ( Revell I can understand especially in 1974)
Anyway my story will be that the tanks have been dropped so that they can get an extra couple of mph airspeed to catch up to "those damned Lancasters".
I hope your cry for help is answered.
Brian