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:
For I consider that the sufferings of this present time are not worthy to be compared with the glory that is to be revealed to us....that the creation itself also will be set free from its slavery to corruption into the freedom of the glory of the children of God. For we know that the whole creation groans and suffers the pains of childbirth together until now.