You get one like everybody else does: remove it from another dish. I suggest from a 6ft mesh dish, that should work fine. Then you adapt it to the offset dish by modifying it to tilt the top of the dish forward so it stays at the 22~degree offset it needs to stay at.
I have installed 4 and 6 foot offsets on BV and AJAK H-H mounts, the principle is the same, you have to allow and build for the movement required to account for the dish offset angle.