Anyone know what the initial setting position for these bolts is?
I can't just reset them to how the old ones were because when I had the car's alignment checked it was found to be out and the bolts were partially seized so I have no reference point.

 

There is no reference position for these bolts. They can only be set to the correct position when a four-wheel alignment is carried out. That will vary from car to car.

Wherever they are positioned now will be fine to get you to wherever is doing the alignment, but may cause excessive tyre wear if you delay the alignment too long!