Derailler bolts and pulleys should be easy to find at any real bike shop. Most older shops will have a box of used deraillers and will either canibalize one or sell you a used one. Normally the pulley width and bolts are pretty standard so it shouldn't matter who made the derailler.

Good luck, best to use blue loctite or equivalent on those pulley bolts since they will often bind the pulley if tightened really tight. Blue loctite is the type that lets a bolt be removed fairly easily.