Greg- I’m getting ready to install the end ribs on both wings, so it was an easy check. Best I can tell the Vans supplied fuel sender plate can only be installed with one hole pattern on the end rib, assuming all the nutplates have been installed properly.
Just for grins, I rotated the plate 360deg trying to align the holes in some other fashion.....no joy. I’m pretty confident that there’s only one viable hole pattern.
I also put the right wing sender plate on the left wing end rib, and it was the same story....it worked but only with one hole pattern....
Not sure of the nature of your issue, but I believe I read a few days ago that both wires should look identical isometrically. The only difference is the way you insert the float in the swing arm ( per the plans).
Knowing the pain you have just endured, hopefully there will be a simple fix out there.