Nevermind, I think I found the original non-j2b versions on modland. There's one that says prerelease too, so those may be from the OEM versions, so I suppose these ones are from the final release? I don't guarantee it though, as I haven't downloaded them myself.

ftp://ftp.modland.com/pub/modules/Impulsetracker/Siren/
ftp://ftp.modland.com/pub/modules/Sc...ker%203/Siren/
ftp://ftp.modland.com/pub/modules/Sc...ren/coop-Hein/