Hey Warren ,
I have the originals on my late 69 08C Z/28 (Norwood). The Larger is 1 3/16, and the smaller is 1 1/16. They are dated 2/69, and 3/69 (2nd quarter and 3rd quarter. )
All my original Smog hose clamps are 1 1/8, and those are dated 1/69, and 3/69.
Hope this helps