[bender]

It really depends upon how you plan to mount them ie: which holes in the arms.

For the front, if you are going to run either of the inner two mounting positions on the arm (IMO required for correct geometry), then they will probably be too long.

The df-02 shocks are just about a perfect fit, it terms of droop to travel ratio, and they are quite a bit shorter than the shocks on the front of my old XXX Losi.

My Df02 front shocks measure approx 71mm between the centres of the two mounting points, possibly a few mm longer when using the longest tamiya ball-end. Maybe someone can post the length of B4 aand Bk2 shocks?

The rears I don't think will be a problem, especially if you use the outer arm hole.