The ridgerunner belongs to my father. I use a Blackbird. I plan on stuffing one of Lostbikers torso length shells for him.
I have been using a no longer available JRB MW3 convertible. I have not been able to do much testing, but the fit seems absolutely perfect as far as I can tell. The full length hook up has proved quite tricky, but the shorter version seems to give a snug fit from the top of my head to about my knees. I figure JRB's current short version should work about the same.
Some pics are here:
Apparently, signature that I used from 2006 no longer tolerated so now deleted.