Hi, we still have a load of band new unsued B4 parts fro sale when we first built up some X6's form B4 kits.
We have approx 7 of the Graphite chassis left going for just £20 each, detials can still be seen from this old thread linked below from when we originally advertised the items (which is still fairly up to date)
http://www.oople.com/forums/showthread.php?t=17530