Front screws: tighten to 48 ft-lb and angle-tighten 90 degrees.
Rear screw: tighten to 77.5 ft-lb and angle-tighten 90 degrees.

AJTnGA,
I tied the pipe tightly to the down side of the control arm and leveraged against a 2x6 piece of wood protruding from either side of the car. The wood was put between the stands and the car bottom. My helper was pushing the pipe down, and I was aligning and inserting the ball joint stud.

AJTnGA, When reinstalling the control arms, the most difficult part (at least, for me) was reconnecting them to the ball joints. New bushings are really stiff, and you will have to tilt the control arms down at a considerable angle to be able to align and insert the ball joint stud. I used a long (~...

AJTnGA,
To remove the bolts (i.e., to pull them out of the holes), you will have to lift the engine by about an inch. If you just want to remove and reinstall the control arms without lifting the engine, you can use a deep offset box wrench to turn the bolts -– I used a Craftsman 44366.

Blue02,

In my 2000 S80 T6 all three screws are identical: M5 x 20 mm with T-25 head. Any M5 screws of appropriate length would work just fine -- you can buy them at any auto parts store or at HomeDepot/Loews. For the central screw, Volvo part number is 965175. For the side screws, it's 969408.