Ring & Pinion Set, 3.73:1 ratio. Must be used in conjunction with 13-0130 installation kit. Not suitable for ENV or 2HA axles fitted to XK-120 and early MK VII. Note: ENV axles can be easily identified by the lack of a removable rear cover, while 2HA axles have a virtually round rear cover. Because the pinion spline differs from original, this set requires installation kit 13-0130 which includes a new front flange with the appropriate spline pattern. The kit also includes sleeves for the ring gear mounting bolts.