Upper control arms bolt size

[First Pooy]

I have adjusted my diff angle and I can not remember if the bolt size was M10 or M12 and I have nothing to measure the bolt with so I.can set the right tension.

[Ben-e-boy]

At least a 12mm I think. 98-137Nm

[mudski]

I have adjusted my diff angle and I can not remember if the bolt size was M10 or M12 and I have nothing to measure the bolt with so I.can set the right tension.

Not sure exactly what you mean and which bolt but I assume its the bolt that runs through the bush. If it is. lather the bolt shaft in Never seize, never run them dry, slide the bolt through, add some thread locker to the thread and tighten that mofo up. No need really to go by spec tension.
I used my impact gun and never had an issue. You dont want these coming lose anytime soon.

[MudRunnerTD]

Make sure you leave them Loose until the car is back in the ground and load bearing in travel position then tighten the bolts. If you tighten them with No Weight with uncompressed springs you will destroy the bushes straight away.