I put these guys on ebay today. These things rule but I only wanted the Starscreams from the set. Here are the links. SKYWARP Ghost Dirge Ghost Ramjet GHOST THRUST
What Basketball Jones is driving at I think is that a ghost thrust is not relevant to G1 canon. I guess for that matter then neither is a ghost dirge or ghost ramjet (I'm pretty sure they didn't get any grizzly movie-style death scenes).
Dirge and Ramjet (not in that order) were also killed by Ultra Magnus in Five Faces of Darkness part 5...about 8:15 into the episode.