NOS GM part number ID
 

Outer window fuzzies Group 10.710, 7645819 and 7645818.
Thanks SYC
Matt

Re: NOS GM part number ID
 

All I came up with was

Buick Special
Strip, Front Door Window /Outer/-AT Belt
66-67/All/-17-67/-Exc Bright Moldings.

That is how the part page lists them in a 1971 Buick book. Found no reference in Chevrolet through 1971, only check Chevrolet and Buick though.

Re: NOS GM part number ID
 

Both #7645818-RH & #7645819-LH are the later issued superseded outside bottom window felts for 1966-67 Chevelle Convertible doors,as well as other 1966-67 GM A-bodies,issued sometime during 1971-72.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.