Did you notice, that when you tightened the nuts down, that the studs were not in the center of the hole? That is enough for me not to use them. OK for rolling around the shop-BUT THAT IS ALL!
Why would the studs not be in the center of the hole?
AND have you ever heard of the 4X4 lifted truck crowd running wheel spacers on their trucks quite often? Are they all going to die a horrible death when they go off-roading?