There is no consistent way of shocks being measured - some are overall length, some are length between centres, some are the stroke length.
As an aside, if you are looking at shocks that are measured by length, you are probably looking at cheaply made third-party hop-ups. These will be no better than the ones on the RTR. The best shocks for your Lazer (if you are racing) are Kyosho's own ones. Although they work out quite expensive!
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