Have any of your guys had any luck with rear calipers (GM Metric style) that have the e-brake built in? I am exploring some e-brake options right now, since I generally use my auto to hold my fj40 in park. I don't have the space for a driveline parking brake since t-case is fairly tight up against the body of the cruiser. I have a Dana 60 with single piston metric gm calipers. Are these effective, if so did you use the factory fj40 parking brake handle?