I plan on adjusting the steering box on my 72 Bav to get rid of some of the play. If this fails, I want to do a rebuild. Has anyone attempted this themselves recently enough to confirm parts are available and that this is possible (vintage BMW mechanic friend said quite difficult a job)? Has anyone sent theirs out and to where? Got off the phone with Meridian Auto in Ca, they have no Bavaria boxes, unsure if they can rebuild one until they see it. The E3 box does not cross reference with any others on RealOEM.com. Tx