Stock carriers are 0 degrees.Kickup + kingpin angle=total caster.
Kickup is controlled by the pivot blocks that mount inner pins of front suspension arms to chassis. Two mounts included
0/4degree and a 2 degree.
I found these at Horizon but they are out of stock.
A9747 Graphite 2 degree carriers
A9753 " " 4 degree.
You can get 4 degrees total with stock kit or up to 8 with optional carriers.