Which rails for S5000?

Hi, 
I'm researching the part number that is needed for a Dell S5000 rack rails. (Or where to buy them?)

I know they aren't ReadyRails, as they're listed as "generic rails". Maybe they're Force10 rails, since that's where I download firmware updates - but it has a Dell badge on it.

The manual includes diagrams on how to install them, but no part number.
https://topics-cdn.dell.com/pdf/force10-s5000_deployment-guide_en-us.pdf

I already found exactly what they look like from this Dell S5000 rack install video:
https://www.youtube.com/watch?v=-8O1fswD-wg

And I know all of it's detailed measurements from this Dell rail compatibility matrix document: 
https://i.dell.com/sites/doccontent/business/solutions/engineering-docs/en/Documents/rail-rack-matrix.pdf

Again, I am simply looking for the Dell part number, or where to buy them (besides a generic template answer of "contact dell")

Thanks all