I honestly never did any research on the 968 because it was my understanding that the 968 was nothing more than the latest model 951 and 952, as far as suspension and brakes are conerned. The 951 and/or 952 has this M030 option now that I remember, in fact, that webpage of the 968 M030 optional parts are all 944/951 part numbers sans the 964 (911) bushing.

This would work safely, as long as the torsion bar was not removed.

Does anyone know if this would work with the early 944 steel arm conversion? I have the entire rear from a 1985 944 for my 1303.