Clif52,
I have looked for it but I could not find it.
You might want to scratch build it, using the original space shuttle as a guild.
As for the Starfighter, here is the link for it.
Buck Rogers Thunderfighter - Modellbaubogen.
I built the model myself, it is a nice model, but the instructions are not that good, so you will have to really know what you are doing, but other then that, like I said it is a good model.
Good luck with the other one.