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As a matter of fact my ole girlfriend had two lumbar supports.I know I know not what you wanted to hear.There is a backrest that changes angle,someone here will know the name.
I know this can be different for each person, but my Mustang backrest adjusts for height and rake. I can lower it enough and tilt it forward to get a nice lower back feel. And then adjust it on the fly when I need a different spot.
So if you're looking for a backrest, of any brand, keep that in mind.