Gearbox numbers should tell you, the earier RR ones all started with numbers e.g 35545633C whereas the later short throw ones started with 12C,13C and the real late ones 28C and 29C. But someone could have changed it around either way.Unless you know its history the easiest way is to put a gearstick into it and then its very clear. Also the later ones had the 0.996 transfer ratio 45/26 teeth (but then again I have found ones that have had the ratio changed to 1.113). The earlier ones had larger selector receivers for the round knob on the gearlever whereas the short throw ones should have a flat gearlever. You can use the flat gearlever on the earlier boxes but not the other way around as the round gearlever will not fit in the smaller slotted selector receiver. Hope this helps.....Brian


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