Drain plug thread size...

Hey all, long time no see. The pony is still running, but needs your help: I did a search, that was inconclusive, so does anyone know the thread size for the '93 N/A car's oil pan? This is the aluminum pan. The bolt head on mine is messed up, I have been using a drill pump for oil changes, but I would like to get a new plug to fix the problem...

Thanks!
 
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