2005 Kenworth T800 Air Slide

Hello, young guy new to working on trucks here, im having trouble identifying the air slide used here/ What needs to be done to it for it too work. air lines are solid but i believe the previous owner put the wrong piston on the mechanism. Cannot find any information on this air slide and kenworth support couldnt help me. The fifth wheel itself is a jost jsk37usb i believe. the piston that was on there was a 12 inch jost cylinder part number SK75015-03

see mechanism below Other than the piston being at full extension when in the locked position, i believe something sheared off here from rust. Ive tried my best to locate a diagram or atleast a model number but have found nothing. See sheared off part below
Any help would be greatly appreciated

 

i removed it because in the lock position the air cylinder is fully extended, therefore the cylinder cannot extend further to release the system.. the cylinder removed is a 12 inch jost air cylinder... as stated above,, been looking for a bit still cant find a air cylinder that would fit... might end up replacing the whole system if cannot find

 

i removed the air cylinder as in the lock position, it would be fully extended, so it wouldnt be able to extend further to unlock the system,, also this doesnt look like my system, mine seems to be way more linear,, with a triangle shaped mounting point for the air cylinder instead of the rectangle bracket. posted below is the air cylinder fully extended

 

i have no clue, thats why i think its broken, theres only one air line so i believe the piston is supposed to extend using air and retract using the natural movement of the springs.. the item i circled i believe to be a pivot point before it sheared off

I made the decision just to replace the whole fifth wheel rather than waste my time with poking and proding and trying to weld whatever onto it to make it work