someotherguy
Truly Awesome
We're just funnin' so I wouldn't worry about it. GM started calling this stuff by its metric measurements probably sometime in the mid-late 80's when they started moving to a lot of metric fasteners on the vehicles. A "squarebody" (1973-1987) half ton 2wd truck had 5x5" with 1/2" studs, the GMT400's introduced 14mm studs to the same pattern so you might as well start calling that 5x127mm at that point and the metric horse is outta the barn.
Richard
Richard