While you chose the non-airbag route, one can replace the SRS reasonably. In the later 940s, both airbags need to be replaced (they go off simultaneously) along with the crash sensor unit, the power supply, and both front seat belts assemblies which likewise activate. The best option is to acquire these from a junk car. While they have a stated ten-year life, all evidence points to a very long life for the pyro units inside the airbags and for the electronics, which are all gold-plated and quite reliable.