[Latitude 28]

Here are some images of the removed actuator.  One image has the part number tag. 

I would say the hydraulic repair shop would be in order not only for the seals but to remove the rectangle end.  One image depicts the clamping apparatus I had to build up in order to remove the rectangle block.  It really is torqued down tight, to the point that until I wrapped it in a rubber sleeve and clamped it to the table in opposing V blocks was I able to remove it.