If you can not find a used Head, you may be better off going to https://www.surpluscenter.com/Hydraulics/ and finding a new cyl that replaces the lengths you need and buy a pair.
I called the hyd shop I use. They work on all kind and all sizes of cylinders. They do all the repairs for places like World Of Fun. They have to do it right. It's almost impossible to get a guesstimante from them with out them seeing it. They did say they would not weld it, no way. The cost to replace is dependent on the threads, mostly. If they could order the part and redo some if it, less cost. Have to make on from scratch, greater cost! If they had to make one, I asked for a high ball park estimate. I guessed the barrel dia. 3", rod dia, 1 1/8, threads unknown. Answer was $550.
I'd be buying two new cylinders from a hyd. supplier.
I called the hyd shop I use. They work on all kind and all sizes of cylinders. They do all the repairs for places like World Of Fun. They have to do it right. It's almost impossible to get a guesstimante from them with out them seeing it. They did say they would not weld it, no way. The cost to replace is dependent on the threads, mostly. If they could order the part and redo some if it, less cost. Have to make on from scratch, greater cost! If they had to make one, I asked for a high ball park estimate. I guessed the barrel dia. 3", rod dia, 1 1/8, threads unknown. Answer was $550.
I'd be buying two new cylinders from a hyd. supplier.