New wheels + wrong lugs/studs = no fun

I picked up some 06 16" e350 takeoffs on craigslist. I dropped off the wheels to be swapped out at my local tires plus. I returned to find the same wheels on my car. They said the lugnuts wouldn't tighten to hold the wheel on. I went out and looked and sure enough the lug was tight but the wheel had a wobble.

What lugs do I need to order? My car has the stock 15" and these replacements are 16"'s with the proper et (can't remember exactly but I made sure before I bought them).

My car is a 91 300e.

Thanks,

Chautauqua