At the purchase, the original arms were present only in the right side of the car (with one not original shock adsorber). 

On the left side an Houdaille was mounted and only one arm was present.  

The horizontal arm was made taking a steel bar of proper size and worked out to obtain the exact copy.

Taking the existing part as sample, the vertical arm was refabricated taking a steel pipe of the same circonference and 1.5 mm thk.