Hey, I don't know about how the sizing works, but I just rebuilt both wheels on my 78 CB550, I believe the spoke nipples are the same size. The spoke wrench I used was a #9. As for cheap and good, I don't know, I borrowed it but it's pretty much just a regular wrench for turning bolts, I don't think you have to worry too much about poor quality. If your size is 5.4mm, the wrenches come in all sorts of sizes, find one near 5.4mm