MC28 for bottoms and you can fit RVF nissins or RC51 (sp1) calipers , NC30 fork bottoms and you can fit NC30 4 pots.
mate a bit confused by your post? what nissins do you mean the std 4 pots from your R they will bolt straight onto your SE forks.
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MC21SP - Roth-tax
CBR400 - track
MC21R - sold
MC21SP - sold