[Farmall] ideas on replacing obsolete hydraulic cylinders - backhoe

[Frank & Sandy Crowe]

OK, this may not be necessarily the correct place for this question, but 
someone might be able to supply me with some answers.

Have a International 3514 loader tractor (1964 vintage) with a backhoe 
(model is 3141 or 3121 we think) with a bad bucket cylinder.  It was 
leaking, unscrewed the cap around the rod and had pieces of steel fall into 
my hands.  The rod seals are held by a steel insert that has a flange around 
the outside, which the big gland nut holds in place.  About 2/3 of this 
flange is broken.  Now I need either to replace this packing assembly, or 
the whole cylinder.

Any ideas on replacing an obsolete cylinder???

Basic dimensions:  Looks to be about a 4" diameter piston, connected by 1 
1/2" diameter pins on both ends, 44 1/2" pin/pin when minimum travel, 71 
1/2" extended, 2500psi (we think) upper end has to fit within a 5" wide 
structure.  And, being the bucket cylinder, needs a reasonably good wiper as 
this cylinder rod does get dirty and wet in use.  Pictures and better 
dimensions available if someone needs them.

I know that they can be custom made, but.....

Thank you for any assistance.

Frank
  (thecrowes at hotmail.com)