May be stupid question but I have a frame with the width of the frame rails the same on all four sides and the same front and back. I have another that top frame rail is same front and back BUT the bottom and side rails have the front wider than the back.....thus the rubber sits in a trough that not "U" shaped but "J" shaped. I believe from pixs that frame with ALL rails front and back are the same width is OEM correct?????? If so what is with the frame with the frame width front and back not the same?
Thank you
Thank you