I forgot to mention that if you are looking for original, you will have to shop around on ebay or you can call either of these two places. They have tons of used parts if you want original. other wise they also sell them same in new reporduction which for this is as good as new.
Kevin Mills, Laurel Mountain Mustang
Dwayne, Kentucky Mustang
They both have websites but your better off to contact them directly and speak to them and "them alone" and tell them what your looking for. They will know exactly what you need when you explain what you have and can give you every item you need. They are both good guys that know their stuff.

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'66 Ragtop, vibrant red, 289-4V, 4-speed toploader
'68 Fastback, space blue metalic, 351C-4-V, 4-speed toploader