Do you already have the movie??
1. Read this a try to find correct subs using Subdownloader
viewtopic.php?t=145
...if you won't find anything
2. Try to search the website for subtitles fitting the same release name. (e.g. DVDRip.XviD)
3. Use some special software and adjust subtitles by hand
p.s. I don't know if I understand, but... How do you know, that the subs won't fit the film??? You have to try.