HELP Identifying Rear Qtr Panels for Convertible '68 Barracuda

mcodecuda said

I’ll go out to the garage later today and I should be able to come up with the part numbers for the rear panels for the Darts and Barracudas. You can then just the list with the part number that’s molded into the backside of the panels.

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The best that I could come up with is that the replacement part numbers listed below. With that said the replacement panels would have had to be painted before they could be installed. That means that the replacement panels may not have the same part number as the production parts had.

1969 Barracuda 2090 right 2091 left
1969 Dart 2092 right 2093 left

I don’t fully understand why the part numbers are only four digits long.
In 67 it appears that the Dart may have used a two piece panel and the Barracuda used a one piece panel.
I couldn’t figure out what was used by part number on either 67 or 68.