This is pretty much what I did for my seals
Feet - Armillaria, the funguar NM in Vunkerl. He's easy enough that a competent Ninja/Dancer can solo him at lv 90 (might be able to do it earlier, but I know it's easy at 90). Also drops War, Thf, and Drg feet seals.
Legs - Manohra, the bird NM in Misareaux. Again, a competent Ninja/Dancer could solo it without any difficulty. Also drops War, Thf, and Drg leg seals.
Head - Berstuk, the slug NM in Attohwa. Not something I could say that a Ninja could easily solo, but it's not a hard fight either. Also drops Mnk, Thf, and Nin head seals.
Hands - Audumbla - the buffalo NM in Uleguerand. Soloable by a Ninja/Dancer, and the hides it can drop go towards the Yaguarogui tiger NM that drops Nin, Whm, Rdm, and Smn body seals, so you can either keep that hide for those or sell it off since they usually go for a nice extra bit of gil. Also drops Mnk, Nin, and Thf hand seals.
Body - Amarok, the lower tier cerberus NM in Altepa. Since it's the only source of the KI for the higher tier cerberus NM Orthrus which drops +2 items and the empyrean weapon upgrade items for Twashtar and Ukonvasara, Amarok is one of the NMs you'll commonly see people putting groups together for. Also drops Pld, Blm, and Cor body seals.
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