I haven't used this particular clutch but my exedy hyper twin i bought gives you the recommended sleeve length on the bearing carrier. The recommended length is 14-16mm, i don't know if that will be the case with your clutch. Here are all the nissan part numbers for different sleeve length bearing carriers. Hope that helps.
30501-A3800 12mm, 30501-N1601 14mm, 30501-U0200 16mm, 30501-S0200 18mm, 30501-B6000 20mm, 30501-S0160 22mm, 30501-K0404 24mm, 30501-K0510 26mm, 30501-N1600 28mm, 30501-N8400 30mm