If the threads are stripped out you can probably run a 1/4-28 tap through them and get some bite out of them... but not much. The hole on the XXX top plates are DEEP and you can run the tap down a ways to get some good bite... then get some 1.25" grade 8 1/4-28 bolts and washer and bolt it back in place... but Id probably add some epoxy as well (grind the basket down and see if you can clean some of the top plate off.
*** be sure to tape off the gap VERY well to make sure that it doesnt get all sorts of cr@p in it. XBL gaps are a little harder to clean out that standard gaps, so the less in them the better.
Thanks,
Scott