Hi mate. My Harrison roller was delivered with the viscous 4.11 GTS-T centre which comes with the 5 bolt half shafts as you've shown above. I picked up a 3.69 helical from the S15 and it has 3 flanges on the half shafts each with two bolts. So you need the S15 half shafts to go with the S15 centre. Make sure you get the half shaft bolts as mine shipped from Sydney without and the wrecker stuffed me around when I asked for them. Genuine from Nissan they weren't cheap! They're an odd design and I couldn't find a good alternative at the bolt shop.
Here are some photos from my gallery showing the S15 diff on the left, R33 on the right. Below that, the R33 half shafts are in the middle and S15 ones on the outside.
