Can't find fitting for Steel City Floor Box
1975 house; discovered electrical floor box in concrete when we pulled up old flooring; new flooring installer cut holes in order to utilize floor outlet; PROBLEM: No area electrical supply dealers carry the 2 3/4" outlet fitting to screw into existing box. I just need the electrical plug and fitting that goes with it to screw into the box so I can use the outlet. Any ideas of where I can get this fitting? At this point, I don't care if it is plastic or brass. I just want it to fit. I am frustrated because I now have two holes that I cannot finish out. One is for a telephone ( I plan to just plug this one for now); One is for an electrical outlet.