I can only say that NOT all R154's have the same input shaft. The 7M are different length to those fitted to JZ series AFAIK. A while back there was a nice picture that showed all the W series boxes side by side and how to ID them which was great. The R154 has 4 'squares' made by the ribs on the side where as the W58 etc has only 3. If still unsure you could always weigh it, as there is a considerable weight difference between the r154 and W55/7/8. Cheers
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