Yes, it is the right one.
http://aminet.net/package/disk/misc/IDEfix97
And yes, it needs FFS-TD64, too. IDEfix replaces the IDE driver so that it supports TD64 commands. The Buddha driver does support TD64 commands on its own. Support for TD64 commands is needed for FFS-TD64 to work.
There is also a free solution using the files from this page:
http://os.amigaworld.de/index.php?lang=en&page=37
But those files are old and beta. You need these programs and patches, too:
http://aminet.net/package/disk/misc/FFS43.19_patch
http://aminet.net/package/util/sys/patchstrip
http://aminet.net/package/util/boot/LoadModule
The FFS patch does not work, you have to apply it manually.
If you understand german, I've written a guide here:
http://thomas-rapp.homepage.t-online.de/bighdd/