Vessels of mercy (σκευη ελεους). Objective genitive like σκευη οργης.

Afore prepared (προητοιμασεν). First aorist active indicative of προετοιμαζω, old verb to make ready (from ετοιμος, ready) and προ, before, in N.T. only here and Ephesians 2:10. But same idea in Romans 8:28-30.