i was after 6pk (6 grove) or 5 when i was looking for my own build and there was none about then also the smallest body denso's (>40A) usualy have 3pk or v belt as std fitments also the denso pully is a small bore so it was sleave and larger bore pully job
powervamp do them now as i just seen at exeter show
i ended up useing a larger birdcage (internal fan) alternator made by mitsubishi 70A with a bespoke mount