The dstar module can be added to any radio that has a built in 9600buadthe packet connector. I cant remember what the module is called, but i will look for it and post it unless someone beats me to it.
Its not what you think... Its for creating a NODE. All this allows you to do is turn your radio into a D-Star to Analog node so that you can talk with say your HT to your 8800 or similar radio and then to the internet.
There are now a ton of GMSK adapters that turn analog radios into DV-capable radios and nodes, and do several other things. We'll need a little bit more information to determine which one you're speaking of.