Today I installed the dummy 7" backing plate on the left side, to match what I've already done on the right side.
Here's how it looks now:
A close up:
With the filter assembly removed. You'll see part of the stock mounting bracket exposed at about 5:00. I didn't want to cut this off. It was necessary to expose that section in order to position the backing plate to mirror the right side:
With the backing plate removed. I painted the stock backing plate mounting bracket flat black. You can see the 1/2" spacers I had to use to move the bracket away from the cylinders to allow the backing plate to clear the crossover tube:
Here's a closeup of the bracket, showing the hole I had to drill:
