I did the same thing, and just ordered a new double tower and 2 perlick 525’s. It was a single tapper before, and the one that came with the kegerator was a nasty affair (chrome flaking off of, all rusty looking on the inside, crunchy bushings and orings). I’ve been trolling around and these seemed to be the ones everyone recommends. I played hell trying to find a shank that would fit in the tower (length wise), but I work in a machine shop and just cut it down to size.
Shop around and you should be able to find 525’s for $25-$30.