8/35 RING & PINION, MK4-7, 15-SPLINE $600.00 For Hewland MK3 through MK7. Can have either 6-bolt or 8-bolt pattern on ring gear. 6-bolt differentials can be modified to the 8-bolt pattern. Hewland Interchange #HC4-221. 15 Spline Pinion. SKU INV-070773 Price $600.00 Quantity Leave this field blank Map Reference B12