I had this idea for a fic and I'm wondering if theres any like it. Anyone know of any fics where modern day buffy goes back in time (for any reason) and meets the whirlwind / spike???

Working on 'whirlwind' being a reference to The Scourge as was suggested in a separate thread (I've never heard that before either), Buffy goes back into Spike's evil past in this one. Dru/Darla are I think referenced and in it a little but I don't think Angel is around as it is set post-curse...

Proud Trophies Won in Foreign Fight by spuffy luv
Instead of sending Buffy on to her well-deserved reward, Glory's portal spits Buffy out into Spike's evil past.

She goes back in time and meets Angel/Dru/Darla in this but Spike is still William...

Another Time, Another Place by proterjerinnocencia
Buffy finds herself sent back in time to 1880 in London. Can the Scoobies save her before the past changes too much? Even if they find a way, will Buffy want to go back?

But I'm failing at the moment to think of one where all of the four are vamps she travels back in time and meets. So I don't know if these even semi-satisfy?

In The Bittersweet series, Buffy goes back in time and encounters William who eventually turns into Spike while she is in 1880 London. There is a brief scene with Angelus/Dru/Darla/Spike.