I did some quick searching but couldn't find a concise list of production changes by VIN #. I pulled the following information out of the Concours manuals. I'm sure I didn't catch everything, does anybody have any corrections or anything to add to it?
Pull Straps
• Up to VIN 05992—at grab handle with chrome “D” ring
• From VIN 05993—at door panel itself
Rear Side Panel (Interior Door Bolster)
• Up to VIN 06092—two-piece construction
• Ffrom VIN 06093—one-piece molded construction
Antenna
• Up to VIN 02710— radio antenna embedded in the glass
Carpet
• Gray interior cars up to VIN 10578—must have light-gray colored carpet
• Black interior cars up to VIN 10578—must have dark-gray colored carpet
• OR
• All cars from VIN 10579—must have a medium-gray colored carpet with a noticeably different texture
Sun Visors
• Up to VIN 01791—have early-style visors identified by vinyl side facing in when in stowed position
• From VIN 01792 to 04200—should have later-style visors identified by vinyl side facing out when in stowed position
• From VIN 04201—have later-style visors identified by vinyl side facing out when in stowed position
Storage Compartment
• Up to VIN 04187 - Lock with black metal centering bezel around key hole, keyed with same key as door/ignition -or- door key for 2-key system
Pedals
• Up to VIN 07199 (all 1981 models)—acceptable either with or without a foot rest/“dead” pedal in the left side driver’s footwell
• From VIN 10001 (all 1982 and 1983 models) must have a foot rest/“dead” pedal in the left side driver’s footwell.
Keys
• Up to VIN 04187—double-key system with an ignition key and separate door key with integrated illumination,
• From VIN 04188—single-key system
Shifter
• Automatic-transmission cars—
o Up to VIN 04836—plain shift handle
o From VIN 04837—”DMC” logo medallion inserted into handle, not molded into handle
Radio
• Up to VIN 10304—Craig W460
• From VIN 10305—ASI
Door Latch/Striker Guides
• Up to VIN 11340—must have metal guides,
• From VIN 11341, except all 15XXX VINs and 16XXX VINs up to 16340—must have plastic guides, all 15XXX VINs and 16XXX VINs up to 16340—should have metal guide
Wheels
• Up to VIN 1883—gray wheels with gray wheel caps
• From VIN 1884—silver wheels with black wheel caps
Hood
• Up to VIN 03200 must have accent grooves and fuel filler flap
• From VIN 03201 - 07199 must have accent grooves but no fuel filler flap
• All CD and DD VINs have neither the accent grooves nor a fuel filler flap, and “DeLorean” hood emblem
Exterior Mirrors
• Up to VIN 05929—housing has a smooth finish
• From VIN 05930—housing has a textured finish
Fascias
• Up to VIN 03599 – glossy finish on fascias
• From VIN 03600 – matte finish on fascias
Door Locks
• Up to VIN BD04199 – all black lock
• From VIN BD04200 – have a black ring and a silver insert