[Mr70]

Both #7645818-RH & #7645819-LH are the later issued superseded outside bottom window felts for 1966-67 Chevelle Convertible doors,as well as other 1966-67 GM A-bodies,issued sometime during 1971-72.
They replace the original window felts,used on the assembly line during 1966-67 of #7580384-RH & #7580385-LH.