14 inch on front, 15 inch on back

Here's a chart I believe is correct:
Tire Size Design Section Overall
Designation Rim Width Width Diameter
E60-15 6.00 8.70 25.50 (340, 383, 440, 440-6 & AAR front)
F60-15 6.50 9.20 25.94 (Hemi)
G60-15 7.00 9.70 26.44 (AAR rear)