CHROME EXHAUST TIPS APPLICATION

Parts catalog information, Group 11-09-37:

1968 Barracuda exhaust extension w/340 & 383: 2883835
1969 Barracuda shows the same number as 1968.
1970 Dart exhaust extension w/340 w/o Noise Red pg: 3466066

I can find no other applications that use either number, nor can I find any supersession information regarding the two.