Steve I have only purchased a half dozen “All Balls” items but every sealed bearing has had blue dust seals and all items have come in hard plastic packaging. I’m sure All Balls would like to hear about shady sellers.
Standard Z1 final ratio is 35/15, or 2.333. A 16 tooth front sprocket and a standard rear is 35/16 or 2.188. A standard front sprocket with a 33 tooth rear is 33/15, or 2.200, so very close to 35/16.
Lately I've been thinking about going to a 32/16 on my Z1 with the close ratio transmission to lower the revs at highway speed, but it would be tougher to start from a full stop because the close ratio 1st gear is already taller than a standard tranny.
I have a couple of Z1B's restored, an '80 KZ1000LTD restored, a 1981 KZ550 restored and a 2008 KLR 650 for off road fun. My wife has a 2019 Suzuki DR 650 for on and off road.