also, on a similar note, if you ever see people mention LG4, L69, LB9, L98, L03 etc, those are all types of RPO codes for the third gen v8 motors. 1LE is a another example of an RPO code made popular by a handling "package"(certain other parts/options (RPOs) ordered automaically trigger the code).
for 4th gens, SS is WU8.. i know that because when i went to buy mine, I gave the salesman every RPO option i wanted in a list and told him to find the car.
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