There's actually a lot of parts that change up from other bikes to the wee Bandits. It takes some looking and a good parts person to deal with, but you'd be surprised. For example, the regulator/rectifier from the 400 is the same as one from a modern day GS500, and one from a Honda CB400 will also work. We had to change the shifter link rod, of course one for a B4 couldn't be found, but it turns out that part also makes an appearance on several years of GSXR600s. I found another part (I think it was the petcock gasket) that changes up with a DRZ400!