Who is your local seal and packing company that you are using ?

If you can't get answers might try this place.

I took an 1845 skid loader boom cylinder to them and they fixed it sourcing whatever seals and packings they needed. (I.E. I did NOT need to take them a OEM repair kit)

http://www.r-lhydraulics.com/

Not too far from TSC and Navistar plant N. of Springfield.