Yellow Eagle,
You can download these craft in the Firebase Ship Pack, Rebalance Ver. 3.56, or Frontierspace 1.74 or 1.75. The Slipstream (or Black Spectre as it is called in Frontierspace) is a highly capable fighter. Quick, maneuverable and easy to configure with a decent weapons loadout.
Happy hunting!
PS: You can download them all here at The Reactor, or if you are having a hard time with Frontierspace, just Google the word Frontierspace and download it from there.