So to wrap this small mod up 🙂
Finished making the alloy post, just milled a flat for the tensioner arm on one side and a small flat for the fixing bolt on the other side.

added a modified Volvo belt tensioner

and fitted a sleeve into the Denso alternator to reduce the size of the fixing bolt from a M10 to a M8, I also added 4mm to the sleeve to act as a spacer so the Volvo belt tensioner fitted perfectly

Just used normal M8 nuts for the trial build, they will be swapped for nyloc nuts when it gets fitted to my vx220.
