Here's a Pair of Universal Joints for the following models -

AUSTIN

Austin A40 Devon       (1947- 54)

Austin A40 Dorset      (1947- 54)

Austin A40 Somerset  (1947- 54)

These come complete with all the required circlips so it's an easy fitting job -

Symptoms of worn joints are - A 'clonk' noise under power / pulling away OR continued clonking if the joints have deteriorated badly.

Here's the exact measurements of the joints -

Cup diameter 2.382cm, Joint Diameter 6.130cm