I don't know about the head issue but I can tell you how to bypass the 404 in filefront site using proxy server. There's a thread about this somewhere in LF not so long ago but I can't seem to find it again.
Proxy site that works for me
Taina's Replacer in filefront
EDIT: Oh, here is the thread: Can't download mods from jkofilefront file not found
... Go straight to post #10 and #18.