The Dexter rubber-torsion-type axles are Torflex #10. The 19' and 21' have cut-down rubber to adjust their spring stiffness to be appropriate, but externally they are all the same except for width to match the frame & body. The brackets have the mounting face inward to meet the mounting plates Escape welds to the inside faces of the frame. Frame width is 1.5" wide by 3" high on 17' and smaller (plus the original 5.0 and early 19'), and 2" wide by 4" high on 19' and 21' (and the leaf-spring equipped 5.0TA).
All Escapes have electric drum brakes (which is relevant to the lower shock mount method - they all have brake mounting flanges).
The remaining specs to check on the Torflex angle that would be relevant to shock mounting include:
- bracket style (low profile or high rise)
- overhang beyond frame
- start angle of arm
Also, a "high lift axle" option is offered on at least the 15' and 17'. I haven't seen one, but I think it is a spacer between the frame and axle, which would increase the distance between bottom and top shock mounts by whatever the lift amount is.