Another purchase at Aircraft Spruce :
Steel tubing for the engine mount = 1/2" x 0.058 (total 17ft) and 1,3/8x0.049 to fit the rubbers, 1/2"x 0.065 for the mounting bolt bushings and flat washers (AN960-616 / AN960-1216). I have also ordered the o ring for the Usher gascolator and 32CMS 1/16 welding rods.