Daz, Im afraid I cant help with your eBay question but there is a right and wrong way to build the diff (I've done it before!) page 28 of the manual shows the spring and t nut going on the outdrive that has the center bearing support, if you've got the sides wrong then the bolt wont engage the nut at all.
Secondly it looks like you've already got the losi aluminum nut holder, which would mean you shouldnt need to get the b4 one, just swap the nut out, (make sure its the right thread for the bolt though!)
Hope this helps.
Tristan
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