Hi, currently have front disc brakes, want rears too!!

[BeetleTwinTurbo]

any suggestions on where to get rear disc brakes?? I'm planning on putting a pretty powerful engine in the back, and well, i'll need to stop harder now....

I already have front disc, dont ask me what brand, since the owner before me put them on....

I'm also thinking of getting some bigger front discs, since i'll need to stop harder once I finally get the engine.