Go to Howeracing.com they have some info there. Also, they have other spindle/ hub options.
The Wide Five hub a different way to run the big wheel bearings. By big wheel bearings Artos pointed out that you can use the same bearings that the ford 9" rear axle uses for outer axle bearings.
There are also other hubs that use the same hub and bearings as a wide five, but have a regular 4.75" or 5" bolt pattern.
The wide five hub was some genius's way of replacing heavy steel, with light cast aluminum. Because, in most upper stock car classes, racecars must use steel wheels. (especially at the bead)
Simplified; They knocked out the center of a steel racing wheel. Leaving only outer ring, therefore reducing the weight of the wheel. then they made a cast aluminum magnesium alloy hub to take the place of the removed steel.
If you dont have rules limiting your wheels to being made of steel, then I would recommend getting the big bearing hubs that you can bolt your Corvette wheels to.