If you have a 1993 940 model with Regina fuel injection, then you will need to verify which style distributor cap you have.
There was a production change in 1993 for 940 Regina equipped models where they moved from the cam mounted distributor on the back of the cylinder head back to the earlier style block mounted distributor near the front of the engine.
This part only fits models with a cam driven distributor mounted on the back of the cylinder head.
Most 1993+ 940 models with REX REGINA ignition systems changed from a camshaft driven distributor on the back of the cylinder head to a block mounted distributor on the left side of the engine (near the front.)
Cam mounted distributor models:
Block mounted distributor models:
Bosch and REX/Regina can be easily identified by the ignition coil: