After spending 1.5 hours cleaning out one of my storage lockers, I found the 6x6 Anti-Newton glass. It is for a strip of 6x6 negs. It is from ScanTech purchased on eBay years ago. See instructions enclosed with glass.
The glass is etched on one side. The other side is normal. It has some nicks on the sides. (See out of focus nicks on edge of light photo.) That was how it came, they were not from me as it was still new in the bubble wrap and I never used. So was not impressed with edge finish.