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Might as well look for another tank too. You'll need one.
Once upon a time, somebody made an adapter base plate to bolt a catseye or skull dash to softail flatside tanks...I haven't seen one in a catalog in more than ten years.
I made my own...I took a cateye base plate and a cast dash base plate...bolted them together...cut them in half...then welded the top half of the cast dash base plate to the bottom half of the catseye base plate...and had to weld on two tabs to make it work.