Well, I got the info from the car and went to that mustangdecoder.com site. It does not really give any info that I already did not know and of course, if you want more, you have to pay for it.

http://www.mustangdecoder.com/cgi-bin/decoder.pl

Classic Mustang Decoder Results

Warranty Number: 1F03H218953

Year: 1 1971
Plant: F Dearborn, MI
Body Series: 03 Convertible
Engine: H 351 2v V8
Unit: 218953 218953


Miscellaneous Vehicle Data

Body: 76D Convertible
Color: 5 Medium Brown Metallic
Trim: CF Ginger All Vinyl, Comfortweave, Luxury Interior
Date: 0671 June, 1971
D.S.O: 21 Atlanta
Axle: 6 3.00:1, Conventional
Trans: U C6 Automatic