There were two different splines used on the Rover pinions. The early ones used the "coarse" 4-spline; the later ones (from around '92 on) used the fine spline, and later again they went from using a nut to a bolt to retain the flange (but kept the same spline). Due to the interchangeability of these diff centres you won't really know what you have fitted without removing the pinion nut/bolt to check. If you need the 4-spline one use 236632.
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