Power steering issues,, need help
 

Have an 01 38 top gun,, it has steered hard since I got it almost like it doesn't have power steering,, even pulls to the left at 50 mph or so,, I've replaced the power steering pump and taken apart the two steering cylinders and checked the o - rings , the only thing I can think of is the hand pump behind the steering wheel, just wondered if anyone would know how to figure out a replacement part number and just any help or opinions.. Thanks