They were originally phospate and oil. Can be reproduced in a number of ways. Ratttle can light grey or cast blast will not be even close
Always remember that even winning "restored" Mustangs have mistakes
Hope this helps
Jeff Speegle
MCA Shelby Gold Card
http://www.geocities.com/MotorCity/6473
Mustang & Shelby research, documentation
http://albums.photopoint.com/j/View?u=1609818&a=12284202&p=44925357&Sequence=7&res=high.jpg
Always remember that even winning "restored" Mustangs have mistakes
Hope this helps
Jeff Speegle
MCA Shelby Gold Card
http://www.geocities.com/MotorCity/6473
Mustang & Shelby research, documentation
http://albums.photopoint.com/j/View?u=1609818&a=12284202&p=44925357&Sequence=7&res=high.jpg