[jordix]

I have a BJ4 WE and I use 501 front arms (much cheaper and stronger) but you must to do some fremel work to the arms and the inner inge pins have a little os lossenes with them due to the difference between metric and english sizes, same thing as the front spindles, you can use them, cheaper than losi ones (and you dont have to waste carriers pieces...) but bearing hole has a gap that you must fill to install it.