I am a salesman so I can access the order guides from Ford.
Here you go sir:
EXTERIOR
• Cloth Convertible Top
• Convertible Boot
INTERIOR
• 6-gauge cluster w/MyColor™
• Ambient Lighting – Map pockets and Sill Plate, Cup holders, Front & Rear Footwells
• Auto-Dimming Mirror
• Bright Aluminum Accent Dash Panel, Pedal Covers Scuff Plate and Leather-Wrapped Shifter Knob
• Bright Chrome Door Speaker Surrounds
• Door Trim Panel Inserts
• Leather Steering Wheel w/Brushed Spokes
• Satellite Radio (6 mos. Complimentary SIRIUS®
Subscription, N/A in AK & HI)
• Seats – Leather, 6-way Power Adjustable Driver, 2-way
Adjustable Head Restraint and Power Lumbar
• Shaker 500
• SYNC®
Those are the included standard features. Besides those, you basically unlock more options that you can add on with a Premium. You can't get the following packages with the Base Mustang:
Comfort Package
• 6-Way Power Passenger Seat
• Heated Front Seats
Electronics Package
• Voice-Activated Navigation with SIRIUS® Travel Link™ (includes 6-month complimentary
subscription – Not available in AK & HI)
• Dual Zone Automatic Temperature Control – Now Includes HD Radi
California Special�
• Unique Chrome Billet Grille with Body Color Surround and Tri-Bar Pony Badge (w/o Fog lamps)
• Unique Side Stripes with "GT/CS" logo
• Unique Lower Fascia with Fog lamps
• Unique 19"x8.5" Argent Painted / Machined Aluminum Wheels
• Unique Decklid Badge with name in Faux Gas Cap
• Unique I/P Finish Panel
• Unique Door Panel "Carbon" Inserts
• Unique Front and Rear Leather Seats with "Carbon" Inserts
• Premium carpeted front floor mats with embroidered logo
• Rear "Diffuser-Style" Lower Fascia
• Pedestal Spoiler
• Decklid Tape A
- Premier Trim with Color Accent
Charcoal Black interior environment with color accented seats, Unique door trim with bright pony badge, dark aluminum dash panel and aluminum shift knob (N/A with Exterior Stripe Options)
- Shaker 1000 is an option on Premium
- HID headlamps are an option on Premium
- There are also a few other options you can add that are groupings of exterior accessories. (read: hood scoops, window louvers, etc...)
- You've also unlocked additional wheel options with the Premium. The Base can only have the 18" 5 spokes or the Brembo kit wheels.
Rapid Specs:
400A- Mustang GT Premium (and any other individual options)
401A- Mustang GT Premium + Premium Trim with Color Accent (and any other individual options)
402A- California Special