question about k member on 70 challenger r/t

first off let me say thanks for your help. new to ma mopar and don't know all the details about them and probably never will.but i will try. i ran across 2 challengers today a 74 318 car basket case but complete and a 70 with no paper work or nothing everything burned in a shop fire but basic body shell. guy claims it's a true 44o six pack r/t car .he's the 2nd owner. he explained to me it was a six pack car because of the k member with a skid plate factory installed was only available on these cars, any truth to this? i didn't try to seem too enthused about them at the moment so therefore i didn't try to see a partial vin on the support or trunk area of the 70. it does however have the remains of the r/t stripes. again thanks for your help.
Author: hot rust