You should be able to find a good one in any number of places. If no one on this site has one, you can try eBay, Hemmings Motor News, Mustang Restoration Shops, Classic Car Junk Yards, Mustang Clubs, Swap Meets, etc. Another source may be Mustang Parts Suppliers...some have their own yards with old Mustangs from which they sell parts. I don't know offhand which ones do but some Internet research will likely be of help.
Good luck, I'll be searching for one myself in a year or so.
Ray