I ordered the Napa replacement calipers for 100.00 each because Napa is local for me. There was no shipping and even though there is a core charge, I can take the cores to my local store and get that 60.00 each back instead of having to wait for the mail system if I had ordered from out of town. Good news There is no left and right front and rear to worry about. The same part # fits any wheel. That's because the caliper is designed with the threaded hole for the brake hose and the bleeder to be the same size. Just install the caliper on your RV and then put your bleeder screw in the top hole and brake hose in the bottom hole! Cake!