I'm with WICruiser, I bought cross sills, bed strips, and a tailgate from Mar-K back in 2019, and kept them in the original packaging. I primered the tailgate and cross sills shortly afterward, but the bed strips were in the tube until Sep '22 when I primered and painted them. No signs of rust even after spending 2 winters in outside storage (unheated trailer.)

Mar-K has a 15% off sale going on right now. I don't think you'll find a better supplier (some of the vendors may even resell Mar-K parts, but I have no way of confirming that.)

Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.