KRT2 has an adapter that allows for direct plug and play for older Dittels like the FSG2T and 71M. The KRT2 also has the mic gain adjustment on the front of the panel so microphone transfer works OK. The only problem is that the KRT2 box is about 2" shorter than the old Dittels - so maybe your wires won't reach. I had trouble with the antenna cable reaching but got it resolved with a little work. I am reasonably happy with the KRT2.
Roy