David:
I am not sure if I completely understand your query but basically the differences between S and L are the wheelbases,
134" for the S and 158 1/4" for the L.
The difference between the 30 and 60 models was, at least from an identification point of view, the wheel/tyre sizes.
The 30s had 10:60X16 sets and the 60s had 10:50X20 sets.
I am not that deep into technical stuff but it is also quite possible the 60s had different gear ratios and the like.
If that was your problem that should help I hope
Bill
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