Should have read: Regular "Boss" rods (C9ZZ-6200-B) had a center to center length of 5.155 and 3/8 rod bolts but Ford "Muscle Parts" also put out a short rod (C90Z-6200-B) with a center to center length of 5.090 and 3/8 bolts, rare in their time and unobtanium now. Keyboard sticking. Bob H