Why not just make your own??? It is not that hard. I made one for our 70RR blower motor opening when I pulled out the heater/AC box as we don't need either down here. I took some measurements, drew it up real quick in my CAD program, printed it out, spray glued the piece of paper to a scrap of plywood. I then ct it out for a trial fit. Once I confirmed it was correct, I did the same only spray glued directly to the aluminium. Cut it out, polished it up and bolted it in. Made a backing plate at the same time that I drilled and tapped, even cut out the center for weight savings (small but hey.
Hope this picture is clear enough:
Back side next to the MSD:
, nice thick aluminum, custom engraved, and mine was custom fit to cover a couple paint scratches. Great product at a great price. 
