Bringing this back from the dead. The 04-current volvo S40, V50, V70 pump works, its a little overassisted IMO though without any restrictor in the pressure line and no CANBUS control of the pump. It fits where the jack used to be as long as you cutout the jack holder's spot welds and hammer the hump down. You need an 11'7" -6 AN hydraulic line if you copy my setup. But I got interrupted writing this by the lady and now, 6 hours latter I'm drunk and tired and I'll finish this in the tomorrow.
This pump has a max output of 120bar, which is about 1760psi, so its quite a bit more than the miata pump can put out. So It rather over assisted. I havent driven the car yet to see if that is a real negative in the feel department or not.
Wiring wise you need volvo part number 30775461 for the high powered harness, and you need to energize the lower power pin closest to the high power connector with 12v to make the pump come on. I used and 80amp relay and an 80amp circuit breaker. The relay and pump turn on signal is taken from the power antenna connector, pump is grounded to the same bolt as the ground strap for the battery and the hot wire that goes onto the battery positive clamp.
Lines run down both sides of the frame rail and inbetween the upper and lower control arms. They enter the trunk behind the same plastic cover that blocks out the ABS wire connection. Yes drilling some holes is required, use a unibit, and use grommets.
Bracket, there is also a zip tie between the bracket and the little shelf the jack compartment cardboard thing sat on.
Here's the hardest part for the lines. Some hammering required here to get the outer line properly tucked away.
You'll need an M16 power steering banjo fitting to -6 AN for the pressure side of the pump, you'll also need to rotate the stock return hardline tube down all the way. On the pump side you need an M14 o-ring sealed fitting to -6AN. The torque spec for this fitting into the pump is 26ftlbs, if you just tighten it by hand it seems to leak.
Oh and no, the reservoir does not hold a complete quart of fluid. FFFFFFFFFFFFFuck.