Clutch splines are different between 5-speed & 6-speed. If you have a 5-speed I think you want the 987 version which has more holding power according to Pelican.
FYI the 987 6-speed splines are different from 986 & NOT interchangeable regardless of what Pelican states in the tech info section. I had the displeasure of verifying this personally! 
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OE engine rebuilt,3.6 litre LN Engineering billet sleeves,triple row IMSB,LN rods. Deep sump oil pan with DT40 oil.
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