AutoZone. They're Duralast brand and special order. Just have the guy look down the mount list (it brings up a bunch). They were at the bottom and listed as solid when I looked them up.
#866223 Motor Mount (Solid) $37.99 ($49.99 @ ZZP) #866209 Trans Mount (Solid) $29.99 ($39.99 @ ZZP)
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'13 Mustang 3.7V6 - MT82 '00 GP SE (L67 Swap, XP, Headers, 3.25") '98 GTP, '01 Bonne