I didn't know anything about the u-joint boxes until a few weeks ago, but the solid shaft boxes can be interchanged. The shaft lengths are different, but you can swap them. Did this a couple of times with GTV and Spider boxes (the shafts are different there, too).The box is the same, but I'm not certain the shaft length is the same. If someone can confirm that, then yes. I don't offhand know how the shaft housing is attached to the box and whether it's easily changed; if it's bolted, then yes. If pressed, a tougher job.