Hi Mods - hopefully you are still doing these.
I'm converting a manual steering rack on an 86 E30 to a power steering using an E46 power steering rack, so need a steering shaft to suit.
The steering wheel end is a 16mm diameter spline with 28 teeth. The other end is an E46 rack part number 7852-974-644.
The existing shaft is a long 340mm long, and the replacement needs to be approximately 240mm long.
Let me know if this is something you can help with.
Cheers