Well done! 👍
I think I ground the rivets out and used elevator bolts when I first did mine (my 87 may be slightly different)
Ultimately I got hold of a 2009 F-150 lower shaft that has universals at each end and welded the pinch spline onto that.
Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.