Start by getting the rubber inserts into the ARB brackets by using some rubber lubricant to push them through.
Then put a small amount of rubber lubricant inside these inserts and slide them onto the ARB. Follow this by sliding on the dust covers (do not forget these!). Then put some threadlock on the ends of the ARB and screw on the balls.
You´ll notice that the balls don´t want to fit into the cups on the front upper wishbones. Many blogs at this point will use a dremel to strip away any excess powder coat. I did this a little bit on one side, but then decided to apply a brute force approach. Add bearing grease to the balls on the end of the ARB and into the cups on the front upper wishbone. Be careful not to put way too much into the cup as it will make the task harder.
Now slide both of the ARB mounting brackets (with the red rubber inserts) together into the middle of the ARB, as far away as possible from the car body. You want to avoid these moving as you deploy the trusty rubber mallet, if you aren´t careful these mounting brackets can drift to one side of the car and scratch the paintwork or even get stuck.
Site one of the balls into the cup and then use the rubber mallet from the front. The below image shows where to apply force with mallet. It helps to hold with your other hand somewhere near the middle while you do this, gently pushing the ARB in the direction of the cup that you are hammering into. It may take a fair amount of force but it will drop in eventually. If this doesn´t work you can use a dremel to strip off some powder coat.
Make sure the ball goes fully in, not just sitting on top of the cup or halfway in :
Then you need to get the other side located, grip the ARB and the upper wishbone and pull it into place as below :
Now again apply force to get the other side of the ARB into position.
You´ll note that as you are fitting the ARB you are cutting off access to the front upper wishbone front bolts, which still haven´t been torqued as we are going to wait until the car is on the ground. However, even with the ARB fitted into both upper wishbones, you´ll see that it can be pushed lower to give access to the bolts, which is what we will rely on later.
Push the mounting brackets both to either side and fit. Only tighten the bolts loosely for now as we will undo these later to allow access to the upper wishbone bolts. Be ccareful not to thread the brackets, the holes can be quite tight. I used some copper slip on the bolts as the holes did feel tight.
Once fitted, pack the cup with grease and fit the dust cover as shown below.