Is this a Highlander? And other Spid questions

[jmking9]

Just bought this 72 blazer. Almost all of the interior is long gone. There is a black dash pad, and steering column. The visors and door panels are present and are parchment. No seats, or carpet. I'm guessing the "special promotion" is the highlander package?? If so, what color would the plaid have been?
My other question is, what did the skid plate look like? And where was it? Under the t-case?
I'm a total newbie when it comes to Blazers, so any input would be great. Thank you