You won't find reference to IXs with that tankage cause they didn't use it.
But the key here is you've got a bastardized Merlin 60 series Spit with parts of the FIX, as well as an E wing, small tail, no tropical filter etc. Yet it's got the tankage of a Mk VIII which is essentially a more refined IX with the pointed larger rudder, tropical filter, smaller ailerons and increased wing tankage. And then the E wing of the late IXE and XVIE post D-Day.
its a mix of the 42-45 versions and in essence covers all kinds of possibilities. I suppose it was the easy way to go instead of having an regular span winged, regular aileron FIXC with a small rudder, a regular wing small Aileron FVIIIC and clipped wing, regular aileron, tall tail LFXVIE.
This would of course cover the 42-43 airwar out of England over France, the airwar in Italy and the Pacific, and finally the airwar over the continent post D-Day as those three variants would have.
Dan/Slack
