Minor detail: Mach 1s could not come with a "deluxe" interior, only the standard or the optional "Mach 1" interior.
Consequently, no other model could be optioned with a "Mach 1" interior. Gives our Machs a tiny bit of exclusivity.
I think your wrong..My 72 Mach 05 vin Has the deluxe interior confirmed by the marti report & the original dealer window invoice...I had posted up a picture sometime ago of the invoice..
I don't put a lot of faith in Marti reports...I've seen several that were incorrect over the years.
The "Deluxe" interior basically consisted of full comfortweave seats, molded door panels, camera-case w/ bright trim dash panels and a few other items.
The "Mach 1" interior was nearly identical with the exceptions of the Mach-1 style 3-tone seat upholstery and the molded and sewn-in pony floor mat "runners".
I have the ordering guides for 71-73 and they all show that the "Deluxe" was not an option for Mach 1s.
Now you say yours is original that way, and that surely may be so...lots of seemingly "wrong" combinations have been shown over the years to be far more common than thought originally.
You said it was on your original window sticker...I'd really like to see that if you could post it.
The standard Mach 1 most definitely did NOT come with the "Deluxe" interior in any way,shape or form.
The basic, standard Mach 1 in 1971 was actually not a very inclusive package.
These are the only things extra that a mach 1 had over a basic sportsroof in 71:
1) 302 2-v V8 (210 hp)
2) Front color-keyed spoiler bumper
3) Honeycomb grill w/ sportlamps
4) Hood w/ NASA-type scoops (No charge option on 302 equipped cars, standard equipment on 351-2v and larger equipped cars)
5) Color-keyed racing mirrors
6) Racing-style pop-open fuel cap
7) Honeycomb texture lower back panel
8) Rear tape stripe
9) Fender and decklid "mach 1" appliques
10) Competition suspension
As you can see, the Mach 1 only included exterior styling enhancements and a slight improvement in the suspension/steering. Minimal interior upgrades on a standard Mach 1.
In 71, the basic Mach 1 Mustang came equipped with the standard interior: All vinyl seats, flat door panels, smooth dash panels, mini-consolette (as opposed to the optional full-length console), no 3-gauge panel in the center stack (just a "mach 1" badge there) and the deluxe 2-spoke sterring wheel (A step above the standard Pinto-style 2-spoke wheel standard in coupes, converts and sportsroofs).
In 1971, on a Mach 1 Mustang, the "Mach 1 Sports Interior" was a $130 option.