Put a steel 5 by 4" wheel on that 100mm adapter. Pay close attention as you hand tighten the lug nuts. Snug them down all at the same time. Then you be the judge if you want to use them.
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!