I don't think the current Ohm drivers are the same as the "F", a true Walsh driver. As such I think you're best off with Dale Harder...
http://forum.audiogon.com/cgi-bin/fr.pl?cspkr&1015294796&read&keyw&zzohm=acoustics
http://www.hhr-exoticspeakers.com/HHRhome.htm
or Miller Sound, who I know of via a friend who's used them and was VERY pleased with the results...
http://www.millersound.net/indexfl.htm
http://forum.audiogon.com/cgi-bin/fr.pl?cspkr&1015294796&read&keyw&zzohm=acoustics
http://www.hhr-exoticspeakers.com/HHRhome.htm
or Miller Sound, who I know of via a friend who's used them and was VERY pleased with the results...
http://www.millersound.net/indexfl.htm