tre5
+1y
I would recommend a two pump setup in that car, but you may be fine if it is a convertible because of the added rear weight. The problem with a 1-5 is that it has fluid transfer and on a car like that it will be very front heavy. Meaning when you dump the front of the car it will drop much faster than the rear. The fluid will not only go back into the tank, but it will also go into the rear cylinders... lifting the rear.
If your machpherson strut is part of the knuckle you will need to cut the factory strut apart and slide the new cylinder into it. This will negate the threaded part of the cylinder. You can either cut the factory strut at the proper height for the cylinder collar to sit on (upside down, like others have mentioned) or you could cut the factory strut lower (below the spring perch) and add a peice of tubing to the factory strut to the appropriate height. I actually have a car here that has a similar setup on it. I will be posting pics next week.