I need suggestion for LA area to install Extreme Dimension body kits

I bought from driven by style then brong it to LTBMW then they cant fit them in. Maybe I'll return it or should I give a shot at other place. This process making me so frustrated. Just want thing to be done soon.

I went to LTBMW but it didn't turn out so well. The Duraflex body kits were trash. Lost a bunch of cash for nothing.