The driven gear for a R154 that matches your end gear... The R154 didn't have one? I see you're running a GTE so (unless it's been swapped) that negates the possibility of a 4.30:1 leaving either a 3.91:1 or a 3.73:1. The former was the LSD in '87 and '89 and the latter from '89 and on (in 7M equipped MKIII's anyway).
Oh, and I have a feeling the driven gear housing is going to be different too... check with a dealer or look it up on the EPC on cygnusx1.
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