That it the clutch adjustor its not broke but does look a little worn. I would suggest replacing it with the pancake bearing style. There should be a ball behind that and a rod behind the ball to the actuator
Its a trinity head.
If u have stock needles id say 27.5-30 pilot 310-320 main clip in the middle on the needle and 1.5 turn out on the air screw... jmo
How does the wrist pin bearing look? I would venture to say its a wrist pin bearing or lower rod bearing cause by the deto u see on the center of the piston.. jmo
Those are lsr you need to call them back and let them know they are the old style that use the 250r ball joints. Back in the day you had to ream the banshee spindles to accept the lsr ball joints cause they used the 250r size ball joints.