Your best choice is uhmw plastic sheet. Apply it to the bottom of the slide with countersunk screws. Uhmw is a slick plastic, and the wear bar is made out of it. Uhmw sliding on uhmw is very slippery, which is what you want.
Edit: At least 1/8" thick.
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'05 F250 6.0 Bullet Proofed - Sold
'17 F350 6.7 Lariet
'02 Montana 3280RL Upgraded a bunch.
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