Brake line adapter

I know what you are talking about. I had the same issue, one is 1/8 line the other is 3/16 line. One is much deeper i nthe master, but what ifound is you can get a tapered seat fitting. it will not go all the way in, but it will seal just fine. The other regualr pipe fittings with not work because there are non taper. Car Quest and many parts stores stok these fittings and misc line sizes etc too to make up what all you need.

good luck!