Only real difference inside between Mk2 S and Mini K boxes (not counting the diff)- the S's 1st motion shaft (22G1371) has 18T, the Mini K's 17T. `S' cluster gear is stamped `22G1040'. Diameter of the biggest gear on it is smaller to mesh with the bigger 1st motion shaft, but it has the same tooth count.
Look first at the cluster gear- if it's a 22G927, it's a Mini-K.
BTW, this Mini K box was also used in 1098 Clubbies up to `73. Clubman GT got the `S' box.
Simon, If you want to move your K boxes post them here- they are getting a bit scarce since people with rodchange boxes found that engine location is way better with a remote box.
I'm pretty sure Makka would take one, for a start.
<edit> p/nos etc added.
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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.
