78 911 SC trailing arm bushings issue

[casor]

I am putting this car back together and I have a problem with the Neatrix rear spring plate bushings. The outer fits into the cover plate and over the T-bar cover fine. The inner does not fit in the corresponding bushing well in the car. The well on the car is conical and the bushings are cylindrical. I test installed a set of conical rubber OEM bushings PN 644-333-131-00 but they are too small in dia resulting in play and what is worse, the spring plate bolt heads will rub against the body. I really d/n know what to do here.

Thanks in advance for your help
Rob Caso