If the install is anything like an E46...the rod end fits VERY tightly onto the bottom of the shifter and the holes in the DSSR are a PIA to line up. The tolerance is VERY tight.
Just takes patience which is something I don't have.
2015 F34 328iX GT Glacier Silver
2011 E90 M3 Monte Carlo Blue
2004 E46 M3 Imola Red