yeah, you aint wrong! i emailed that parts company but they reakon they dont have anything that works at 5psi!
Busy looking at saab 93 turbo and rover actuators to try and find a relevant one. 6psi seems to be the norm but theres soooo many variations on the blowers that im gonna have a meltdown...!
Found one on ebay but refuse to pay £184 for an actuator when the turbo only cost me £30!!!! (snapped studs and lazy owner!!)