Odd spring shackle removal

[johndee138]

While I am waiting on motor repair stuff I thought I would install a Posie reverse eye spring I've had lying around for a while. After getting the old spring loose I began to tackle the shackle (rhyming too!) in the axle side. It isn't like any I've ever seen before. Period aftermarket I suspect, but it seems to be worth saving since it is all metal with grease fittings and they actually work. The shoulder that the shackles ride on is a 3/8 square. The through bolt portion unscrewed from the threaded housing.
It isn't compatible with the shackles I have with the Posie spring. They are longer, set up for bolts and have round holes.
The ones on the car now have square holes
I'm not real sure how to pull the outer part that is in the axle perch yet. If I get lucky the thread pitch will be a common one and I can thread an appropriate bolt in and get some traction that way.
My question is: Is this worth saving? It is a reuseable part and has lube points on both pivots. I could cut it up, but then its toast.
Any thoughts on if I should try to save it?