also if there is no removal threads in the drums, U can drill and tap some yourself (easier if you know how the hub looks under it) just drill an 6.5mm hole then tap it with an 8mm bottoming tap, you can tell when you go from drum to hub as the drums are cast iron(Usually) and the drilling swarf will be a grey powder, the hubs should be steel so will get a normal swarf, u will need to drill into the hub a few mm's to allow tap to work