Well yes, and no.
They are welded in. But replacement buckets are routinely available (from your local dealer or Stoddard, $100 and change last time I bought one). Most any body shop could do the replacement for you.
The bolt you see just is an attachment point for the bumper IIRC. It doesn't remove the bucket.
If you have no rust in the bucket and the only problem is the headlight tab threads, you could either get somebody to weld in a new piece (tab with a nut brazed to it) or try one of those clip-on "speed nut" things.
Good luck,
Chris C.
73 914 2.0
70 911E Targa
campbell.chris@gte.net
[This message has been edited by campbellcj (edited 09-12-2001).]