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I'm pretty sure NOS stands for "New-Old Stock" and it's parts for a classic vehicle that were actualy made back when the vehicle was still new but they never got used or installed so they sat in their boxes for all these years till somebody today finds them
Slicks is just a nickname for the '61-'66 ford trucks because the body style looks pretty "slick", especially the styleside beds. Some of the years just before are called "fridges" or the "orphan" trucks to