The ones from GM don't have the patent number...or not that I saw. I have 4 or 5 set on the shelf & they all have ribs. I would hope you're not going to loose points for no patent numbers....Joe
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1968 Z/28 Corvette Bronze. Black Hounds Tooth. 02E Los Angeles born 3/13/1968 pnt OO
1969 SS396 Yellow/Yellow 08E Norwood born 8/28/1969 pnt 76E
1970 'cuda Moulin Rouge, 440-6, 4 speed
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