Welcome to the forum. Some guy in Garland, Tx claims to have all 4 parts.
I have not done business with this entity. He may be a dealer?
Let us know how you make out.
This member found a hydraulic/pneumatic actuator rebuilder and I hope they made out OK:
At over $500 that he is asking for his new cylinder, a commercial/industrial rebuilder may be a better deal. Cylinder specs are usually meeting standard seal/ring sizes. Call & ask. An example:
Bay Area Machine had served the Bay Area for over 35 years. We specialize in hydraulic cylinder repair, gearbox repair and metal fabricating and welding.
www.bayareamachine.com
If this is the wiring harness that flexes, fatigues and breaks wires, you may want to save the connector ends that are still good. Someone can renew the wires for an as-good-as-new harness when these are totally gone.
I have a 1962 Lark, 1966 Imperial & 1998 Sebring JX, so I know all about repairing what can't be replaced. I know that you don't expect to have this difficulty on a 10 year old car, but some parts are still around (i.e. - the ones that don't break very often).