I also bought the cheaper E36 steering boss only to find it didn't fit properly, you need
https://www.ebay.co.uk/itm/OMP-STEER...AAAOSwbe5ac6lK
Of course, this is a lot more expensive. When fitting the "clock spring" assembly i could only get 2 of the 3 mounting screws in but it all works and cancels the indicators as well.
no spacers were needed.