How do you make the rear but not the front?!
Metzler makes a rear whitewall that will fit the VTX, but the corresponding front for that rear is the wrong size. They just don't make a front whitewall that fits.
And yes, they've been asked. Their standard reply is that they don't see enough market interest to invest in making a front whitewall in the size we need.
So, if you want whitewalls you only have two choices:
Or Metzler, and the infamous whitewall paint. (I hear it's actually pretty good stuff!).
From what I hear, the Metzlers don't give any better mileage, but they do report to handle better. Dunno how true that is, I've never run them (on this bike).