I have a pair of Key Blanks that have the letter "C" stamped on them. I purchased these a long time ago and don't recall what year they fit. 1970, 71 or 72? (I wouldn't have bought them for any other year) . . . Not sure what they're worth but I'll post them for $20 $5 for shipping in a padded envelope - U.S. 48 I accept Pay Pal and all major Credit Cards. Order by phone by calling (715) 874-6037 Check Website for Phone Hours! Thanks for Looking, Best Fastener Collection in the country for 1970 - 1972 Buick GS, GSX & Skylark! And Made in the USA. Don't like dealing with the Big Name Retailers? Give me a shout. I'll be happy to help and share 30 + years of experience in Racing & Restoring Buick Muscle Cars. Check out my New Website for 100's of Buick GS, GSX & Skylark Restoration Parts! I now have an OEM Page as well with 100's of parts to be added as time permits! www.Stage1Restoration.com