I just had this conversion done in my cefiro. I had my mechanic do it, but he didnt go nuts with charging labour, and I had to do the clutch, fly wheel ect, my standard tailshaft was stuffed pretty bad, so then I had the extra cost of a 1 peice. MY conversion totaled about $3500... inc labour.
Anyway, we used the standard cefiro crossmember, just added to it. We used the naravra speedo drive = 32702 - 02G17 pinnion assembly , brand new from nissan, $22.00 . Just needed to take the r33 gear off, and put it on, do that how you see fit. You need a R33 clutch slave cly too, I got that brand new off the shelf from nissan for $81.20 or something. To have my standard tailshaft modded was about $250-300, but it was stuffed, so I ended up with a full brand new 1 peice for $450.00. The clutch was the killer, that was about $1150.00, but new fly wheel, clutch, and recoed clutch plate, all done by Jim Berry.
Hope that helps.