Don't get discouraged. I would check NPD first. maybe mustangpartshouse second. They seem to have more of the oddball stuff. Beyond that, there are literally hundreds of companies out there that handle classic stangs, plus swap meets, classifieds, and of course, old fashioned networking.
Trust me, you can find ANY part with patience and perseverance.
J
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'66 Mustang Coupe- AKA "Lenore" *on disability for a (long) bit*
'93 GT Mostly stock AKA "Fawkes"
Rice Haters Club Member #239
"I find your lack of faith...disturbing."
"Every normal man must be tempted at times to spit on his hands, hoist the black flag, and begin to slit throats." H. L. Mencken