Never heard of such a thing, sounds like an urban legend to me?
FOR SALE BUICK: 1987 GNX, serial number 24, 19,000 miles, original tires, awesome, the first 100 GNX had special trunk carpeting with embroidered serial number (also serial number on the dash), original papers, sticker, articles, etc, $35,900, best offer. Contact: 831-384-1321 office, 408-847-2983 home, Gilroy, CA; grl0321tb@aol.com
FOR SALE BUICK: 1987 GNX, serial number 24, 19,000 miles, original tires, awesome, the first 100 GNX had special trunk carpeting with embroidered serial number (also serial number on the dash), original papers, sticker, articles, etc, $35,900, best offer. Contact: 831-384-1321 office, 408-847-2983 home, Gilroy, CA; grl0321tb@aol.com