Help - Grease able Pivot Shafts

So I recently purchased greaseable pivot shafts for a 67 Big block dart (from a reputable company). I had the bushings installed in the lower control arms with the pivot shafts and this past weekend I went to install them. Only to see that the shafts fail when I torqued them to 90 ft-lbs. The 67 dodge service manual says the pivot shaft nuts are supposed to be torqued to 130 ft-lbs. The kit I received did not have any installation instructions and I could not find any information regarding installation on the company's website. I am still waiting to hear back from the inquiry I sent them yesterday.

Has anyone used these with any success? What did you torque the nuts too? I was talking to a sales rep and they told me to torque them to 60 ft-lbs. For an application such as this, I feel like that is way to low.

But if they are only to be torqued to 60 ft-lbs, I have a major concern (since the ones I have broke at 90 ft-lbs and the service manual says torque to 130 ft-lbs) that the greaseable pivot shafts are much weaker than the OEM parts. So has anyone been running these on there cars and not had problems with them?

Thank you in advance for your advice/help