Help - Grease able Pivot Shafts

These are from Hotchkis Sport Suspension (item # 3005). Which I was under the impression they were a reputable company. But below are some of the pictures I took of the shafts.

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This is comparing the old shaft to the new one. The shaft in the bottom picture is my original one where as the one on the top is the replacement. You can see the grease able shafte is a little shorter on the left end that gets placed in the bushing (however the OEM one has that metal sleeve which makes it a little longer, so I dont think that this area is of concern). But on the right you can see that the shaft is tapered a little differently closer to the flange. As for the threaded end, I do know if that was elongated due to the shaft stretching during torquing.

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This shows the shaft side of the failure. As you can see it was a ductile failure instead of a brittle failure (which is probably a good thing).

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This image shows the threaded side of the failure. You can see the material surface a little better here. But the breakage has me wondering what high strength steel they are using.

So has anyone used grease-able shafts with success? Should I just stick with my OEM ones? Anyone use the OEM shafts with urethane bushings?