It is much easier to heat and bend the ears on the bat wings if the frame is upside down. Heat the bat wing in the shaded area and pull the hair pin to 3/4'' from the frame rail. After the bat wings cool down, run a 1/2'' x 5'' bolt thru the bushing on the hairpin. Cut a piece of 7/8'' dom 2-3/4'' long and slide it onto the 1/2'' bolt with an 1-1/4'' od x 1/2'' washer between them. Shape the hole in the outside frame plate so the dom tube fits thru it when the plate is flat on the frame rail. The frame plate will hang down 1-1/2'' below the frame rail. Loosen the muffler clamp so you can rotate the hair pins to line the dom tube with the outside frame plate. Check to see that the frame plate is the same distance form the front cross member on each side. Tack the tube to the plate with 3/4''between the bushing washer and the frame plate. Tack the frame plate to the frame rail. Shape the inside plate for the tube so it is parallel to the outside plate. Finish weld the plates and the tube.
Turn the frame over and remove the angle iron and muffler clamps. Install the spring with the two 1- 3/4'' x 4'' plates between the spring perch and the spring. This will give you an approximate ride height.