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They might have used those codes because it would have changed the grill and rear tail panel to the RT black.



Good point, but why group them under "A" instead of "M"?



I believe that most of the 'A' codes denoted a group of options and/or changes, whereas 'J', 'M' etc would be for a single option that did not require any other supporting equipment.

For the elastomerics on the R/T, the grille & tailpanel are already blacked out as standard equipment - the bumpers would be the only change, hence the 'M' code. Though given that left/right racing mirrors are usually part of an elastomeric package perhaps not having a group code is an oversight.

For the non-R/T versions, the 'A' code would trigger the substitution of R/T grille & tailpanel as well as the requisite blackouts on the car.

Some examples of 'A' codes:

A46 - SE moulding group. It is comprised of several individual 'M' moulding codes: front stone shield moulding, stainless belt moulding etc.

A04 - Basic group: Power steering, deluxe wheel covers, R11 Music Master AM radio, J25 variable speed wipers