Thanks for the comments guys.
The Chevy Duty (ClassicParts) door sills showed up today.
The pictures do not do them justice. These things are beautiful! They are polished to a blinding shine and snugged right into place like factory units. They’re not for the purist, having no Chevy or GMC logo and the embossing is more shallow, no doubt for ease of production polishing. But these really brighten up the whole interior compared to originals in any condition.
It’s amazing how one improvement can inspire another. The sills look so great, now my floor looks pathetic. I currently have a tired rubber mat and a metal floor covered with chipped paint. It may be time for carpet or one of those LMC Polyvinyl mats that cover the entire floor.