the C section will work nicely... I've done it before...
after a few trips the owner decided they were a mite sticky and replaced one side of the C section with the PFTE nylon stripping (thats how I learnt that trick)
if you do the C section you can also buy a single roller bearing that fits inside of it and mount it at the back of the draw (if you affix the c section to the vehicle) or to the back of the vehicle (if you affix the C section to the drawer.
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with the C section chamfer the leading edges with a radius curve so you dont jag things on them or have them gouge each other.