Off Grid Build Fixing up a rusted out cast iron wood stove

Nice antique cast iron arched top heat grate wall register. Rough in opening 13 tall x 15 1/2 wide. antique cast iron arch top rust heat grate 13x16 register vintage old 383-22b. 17 1/8 wide x 14 1/2 tall x 2 7/8 thick.