IMO AGX struts aren't a requirement. They're adjustable, but if your like most people, you'll just set it and leave it anyway. I'd just go with GR2s and enjoy the savings.
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'13 Mustang 3.7V6 - MT82
'00 GP SE (L67 Swap, XP, Headers, 3.25")
'98 GTP, '01 Bonne