Since ASCD isn't doing anything at the moment and SLP discontinued them, you're looking at used or custom.
Don't even bother with Ed. The chances of him having one are slim, if he does it's probably already been claimed.
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'13 Mustang 3.7V6 - MT82
'00 GP SE (L67 Swap, XP, Headers, 3.25")
'98 GTP, '01 Bonne