FRONT WHEEL --- 6" x 15", 6 LUG PILOT HOLE = 4.625" 6" BOLT CIRCLE USA MADE TO DETERMINE BACKSPACING, LAY THE WHEEL FLAT ON THE GROUND WITH THE BACK OF WHEEL FACING UP. NEXT, LAY A STRAIGHTEDGE ACROSS WHEEL AND MEASURE THE DISTANCE FROM THE BACK SIDE OF MOUNTING SUR --- International Applications: IH / FARMALL MODELS