Thank God my truck had them when I bought it. They are not perfect but cleaned up nicely.
I suggest you call Jim Carter before looking elsewhere.
I've seen repros are available for Chevy but not GMC. I don't recall the supplier but I believe it was either chevy duty or bowtie bits.
I've seen some pop up at Jim Carter's on occasion in the garage sale section of the site oldchevytrucks.com
I've also seen some on occasion at Rob English's site oldgmctrucks.com, but he will take every penny you have.
And I've seen some pop up here and on ebay.
Good luck.
