Believe you can use the 69 grill color of Ditzler #32947
ANother person in the past suggested (haven't tried it but it would not cost mcuh to test)
"The best match to NOS that I've found is in spray can form. It's made by SEM and called Medium Driftwood Metallic, paint number 39023. Best chance to find it is an automotive paint store."
Hope this helps
MCA Shelby Gold Card
Mustang & Shelby research, documentation