79 Silverado Mystic Silver interior

[79big10with454]

I am looking to replace the carpet and seat cover on a 79 Silverado with the Mystic Silver interior.  The seat is coded with 12D - LMR1 Mystic Custom Cloth.  Trying to locate a place to but these items if anyone has any suggestions.  Ideal would be the same place to make sure the colors match.  So many places I find only have grey.

Thanks