This profile is spurious. I don't know where the ID came from. There were only two X-29s built, and I can't tell from the photos which one of the two it is.
Both X-29s are profiled with correct IDs, one being 82-0003 and the other being 82-0049.
And while you're looking at those two profiles, they show to be linked as the same aircraft due to lack of c/n; they need to be de-linked.