I also have an AT120 tuner, my plan was to used it with my new M710 radio. Having said that if the deal was right I might sell it with the M700 and get an AT-130 for the new (to me) M710.
There is very little difference between the AT-120 and the AT-130. The major difference being the memory of 8 versus 30 channels by the 120 / 130.
Let me know (PM) if you are interested in both, maybe we can work
out a deal, if would only take me 5 minutes to remove it. 4 screws and one wire.