I am not an expert on the subject but I have never heard of them. Traditionally the 16.5 wheel was a split rim used on heavy duty (3/4 ton or more) pickups. Split rims are inherently dangerous to mount a tire on; during inflation if the two halves of the rim aren't married up properly they come apart under pressure, usually with a big bang and have been known to kill whoever was hanging on to the air hose, hence the cages on the side wall of the tire shop. Also, due to the heavy duty nature most spilt rims are going to have more stud holes than five, generally eight. When the big three went away from split rims on their pickups the wheels and tires were changed to 16". I know now days wheels can be of almost any height but back then things were very standardized.