Any recs for AtS-BtVS crossover Spuffy fics? Not S5, though. Looking for the more unusual ones, which means earlier AtS seasons. Can be the Fang Gang going to Sunnydale, or the Scoobies (or just Spike and/or Buffy) going to LA.

Harbingers of Beatrice by Holly.
Set in Season 5, post Triangle. Wolfram and Hart, host of the greatest evil acknowledged on Earth, attempts to restructure the Order of Aurelius, one vampire at a time. A soul hampers one, a chip harbors another, and a Slayer stands between them. The pawns are in place; it is simply a matter of who will move first.

Bent by Kari Mouke (It has Spike/Buffy/Angel relationship). It is a season 4/season 1 crossover. PM if you want one.

Never Be the Same Again by maryperk. Starts in Harsh Light of Day. When Spike helps Buffy pull a fast one on Parker, things turn out much more complicated than they first appear.