Rare Blazer wheel? 16.5 x 6

[MusicMan70]

Searching the CL, I found these advertised 16"/6-lug wheels with 9.50 x 16.5 tires.
Hmmnn...I'd not heard of those; some kind of mix up maybe?
After some research here, I discovered this info (unverified):

1969 Blazer (6 stud, 4wd only)
Std. 15x5.5
Opt. 15x6
Opt. 16x6
Opt. 16.5x6

1970 Blazer (6 stud)
Std. 15x5.5
Opt. 15x6
Opt. 16x6
Opt. 16.5x6 (4wd only)
1970 Jimmy (6 stud)
Std. 15x5.5
Opt. 15x6
Opt. 16x6
Opt. 16.5x6 (4wd only)

Still unsure, I went to take a look and bought them any way.
If they were the optional 16 x 6's, I'd still be good with them,
but they turned out to be the 16.5" x 6.00

Since they don't come up that often; and I spent some time
looking on this forum for that information, thought I'd post.
Mostly for the purists but we can all learn something.
These are not for sale. Anymore info is welcome about these.

This link to a great build, I believe has these same wheels.

http://67-72chevytrucks.com/vboard/s...=329775&page=8

Now some pics;
First photo, according to my archives, is the 16 x 6 steel option

Second or red wheel is the 16.5" wheel, 3 nubs for the 10" cap and 4" backspacing/3.5" center hole.