Unique number of lugs

[Mitch]

I always liked the chevy sprint ,ala 1980's. That used 10mm wheel studs. I mean really? a 3/8" diameter stud holding the wheels on. They were the same lug nuts used on my Honda ATC.
And the fords with the sterling rear ends, 7 1/2" studs and 1 9/16 stud. I think those were designed by congress.
And of course the ford courier, the first years used left and right hand studs.
I always wanted to see someone balance the tires and wheels on a Citroen, the center hole was only 10mm

 

[Red91]

Some late 90's Ford F-250's have 7 lug wheels. About the GM Astro and minivans, it's worth noting that '85 to '02 Astro vans had five lug wheels, and used the same "5 on 5" bolt pattern as '70 to early '99 half ton GM 2WD trucks. '03 to '05 Astro's used the 6 lug pattern of the '99-up GM half ton 2 and 4WD trucks. '90 to early '05 GM APV's had 5 lugs, whereas '05 and up APV's had six.