Xerox Paper, who's really making it

[Zwicker Press]

It's seems to be common knowledge that Xerox copy paper (text weights) is Hammermill.

What about the Color Expressions Elite Cover (comes in 60, 80, and 100#)
Very smooth bright white uncoated cover

and the Digital Color Supreme Gloss? (Xerox's version of Kromekote)

It's not a price thing but a size issue, as these Xerox sheets are only available up to 12x18 (from our supplier anyway)
They run great on our Ricoh 720, but sometimes the jobs require a 13x19 sheet to be cost effective.

Any thoughts?