. . . And I was that parts person for 46.5 years (but in GM). What I said to customers depended on if they were a retail customer, wholesale customer, or internal/dealership customer. Each was a different perspective on things.
Although I knew the codes and such, when talking to a customer over the front parts counter, I always took care to speak in words/phrases THEY could understand. NOT using the same words I (or others) might use when talking to somebody with more mechanical or product knowledge. Things just worked better, quicker, and more accurately that way. Even devising questions I could ask to get the correct part for their "Silverado", when we had THREE truck platforms which could be "Silverado" (two as trim levels and one as a platform name). Luckily, EACH one had different outside door handles and hvac controls!
Many of my work associates would use the "Old Body Style" or "New Body Style" question. To the customer, as the vehicle was only 1 year or so old, to them it was "New Body Style" . . . which resulted in the wrong parts 90% of the time. Nobody wants that! I explained my strategy of why it was happening and they immediately understood that.
As to Chrysler trim codes for interiors, one part of it is the seat type and the other part is the color. The Color and Trim Guide details each trim level, fabric/vinyl/leather combination, and seat type in graphics. With swatches of the vinyls/leather and fabrics.
Even knowing these things, IF I had any doubts, I always went into the catalog for verification.
Always had a phone book handy, too. Before "speed dial" was a thing. Although the most common-use numbers were (and still are) in the archived memory section (which seems to be taking more "keys" to get unlocked, sometimes).
Enjoy!
CBODY67