HEY BARAK , MEASURE FROM THE OUTSIDE OF THE FRAME RAIL TO OUTSIDE ACROSS THE BACK END , SHOULD BE APPROX, 40.1 INCH.NOW SPLIT THAT AND MAKE A MARK ON THE FRAME REAR CROSSMEMBER SHOULD BE IN THE CENTER , FROM THIS POINT NOW MEASURE 15.15 INCHS TO EITHER SIDE AND THAT WILL GIVE YOU THE SIDE TO SIDE CENTER ON THE HOLES ,ON THE FRT TO REAR MEASUREMENT ,FIND THE CENTER OF THE FRT BODY MOUNT AND MEASURE REARWARD 153.9 INCHES AND THAT SHOULD GIVE THE CENTER TO CENTER OF THE GUSSET HOLES .. THEY HAVE A STRANGE WAY OF LISTING THE FRAME MEASUREMENTS . JERRY