What side valance/skirt/ ground effect would work on a B?

I know the chances of finding a set of side skirts would be nearly impossible for my 90 B2200, but I would bet there are some from other more popular trucks like the Ranger, or S10 that might fit.

Any of you done this, seen one done at a car show?

If anyone has a Ranger, Toyota, S10 would you measure from the rear of the front car to the rear of the cab, then from the end of the bed to the front of the rear wheel.