According to my interchange manual they will work between 1969 Barracuda,
69 Dart, and 69 Valiant.
318 With out a/c or max cooling 19" width part #2949031
318 with a/c 22" width part# 2949067, max cooling 22" part " 2949068
340 without a/c 22"width part #2949066
340 with a/c 22" width part...