So having recently done this myself i thought i would write it up, as the other well known brake thread only covers the Peugeot 505 GTI disc scenario.
https://zclub.net/community/index.php?threads/toyota-hilux-peugeot-505-brake-upgrade.17515/
For this conversion you will need,
Z31 Vented...
This is the kit from Silvermine Motors in the US - Edan advertised in the classied here a while back. Good customer service and a recommended source for this conversion. I bought his stage 2 big brake kit minus the calipers, which I already had a new set of.