I am not familiar with those models, but the first thing would be to determine if they use the old 121.5 frequency or the new 406. If they are the old frequency I would deep six them as not worth repair. The most popular one right now seems to be the ACK E-04. It is the new 406, probably the most reasonable in price, and works reliably with no issues. Kitfox will sell it and they also use it in their SLSA's. Comes with antenna and ability to tie into your GPS.