Did some searching too and did not come up with anything.
How long do you need it?
I have some longer pieces left over from a old stove I completely rewired a few years ago.
The box is long gone so I don't have a part number or anything else. My local parts dealer, http://www.deydistributing.com
got it for me and from what I recall they even had some trouble locating what I wanted at the time.
Three strands, the red and black wire is 7 ft, 4 inches and the white wire is 10 ft, 2 inches.
Not sure on the gauge as it don't say on it, but it's larger then what I normally see in todays ranges.
It's for sale so if your interested PM me what you think is a fair price and will go from there.