What did you do/use for the extra pulley.
Thanks
That V8 one is for the serpentine belted V8 and the second alternator is fitted in place of the air-conditioning pump so no extra pulley required, but I do believe there is a different tensioner required for the AC serp belt.
The 300Tdi is simple bolt on mount and uses an AC serpentine belt to make it work.
The 200Tdi is a lot, lot more complicated and requires a different crank pulley to be fitted to the crank damper, it also mounts the second alternator in place of the AC pump on top of the timing case but as it runs a V belt configuration it has a tensioner stub that replaces the injection pump cover plate and a tensioner pulley is mounted on that to tension the belt, much more involved than either of the other two installations.
Hope that helps.
If you need pics from the 200Tdi set up I have the full Gwynn Lewis kit up stairs in the spare room ready to go on my Discovery, I'll probably do a write up on fitting it when I do it to help folks out who are thinking about fitting the second alternator.