From a press release issued by the FIM:

Superbike World Championship
Supersport World Championship

Phillip Island-AUS (28/03/04) : entry list –
Superbike World Championship

4, Troy Corser, AUS, PETRONAS FP1, Foggy PETRONAS Racing
5, Piergiorgio Bontempi, ITA, Suzuki GSX-R1000, Zongshen Team
6, Mauro Sanchini, ITA, Kawasaki ZX-10RR, Team Kawasaki Bertocchi
7, Pierfrancesco Chili, ITA, Ducati 999R, Team PSG-1 Corse
8, Ivan Clementi, ITA, Kawasaki ZX-10RR, Team Kawasaki Bertocchi
9, Chris Walker, GBR, PETRONAS FP1, Foggy PETRONAS Racing
12, Warwick Nowland, AUS, Suzuki GSX-R1000, Zongshen Team
16, Sergio Fuertes, ESP, Suzuki GSX-R1000, MIR Racing
17, Chris Vermeulen, AUS, Honda CBR1000RR, Ten Kate Honda
19, Lucio Pedercini, ITA, Ducati 996R, Team Pedercini
20, Marco Borciani, ITA, Ducati 999R, DFXtreme Sterilgarda
23, Jiri Mrkyvka, CZE, Ducati 996R, JM SBK Team
24, Garry McCoy, AUS, Ducati 999R, Team XEROX Ducati – Nortel Networks
25, Alessio Velini, ITA, Yamaha YZF R1, GiMotorsport UnionBike
41, Noriyuki Haga, JPN, Ducati 999R, Team Renegade Ducati
50, Miguel Praia, POR, Ducati 999R, Team XEROX Ducati – Nortel Networks
52, James Toseland, GBR, Ducati 999R, Ducati Fila
55, Régis Laconi, FRA, Ducati 999R, Ducati Fila
69, Giancluca Nannelli, ITA, Ducati 996R, Team Pedercini
91, Leon Haslam, GBR, Ducati 999R, Team Renegade Ducati
99, Steve Martin, AUS, Ducati 999R, DFXtreme Sterilgarda

Supersport World Championship

2, Stéphane Chambon, FRA, Suzuki GSX-R600, Suzuki Alstare Corona Extra
4, Jurgen Van Den Goorbergh, NED, Yamaha YZF-R6, Team Yamaha Italia
8, Alessio Corradi, ITA, Honda CBR600RR, Team Italia Megabike
11, Kevin Curtain, AUS, Yamaha YZF-R6, Yamaha Motor Deutschland GMBH
15, Matteo Baiocco, ITA, Yamaha YZF R6, Team Lorenzini by Leoni
16, Sébastien Charpentier, FRA, Honda CBR600RR, Team Klaffi Honda
18, Denis Sacchetti, ITA, Honda CBR600RR, Team Italia Megabike
19, Walter Tortoroglio, ITA, Suzuki GSX-R600, Celani Team – Suzuki Italia
20, Vittorio Iannuzzo, ITA, Suzuki GSX-R600, Suzuki Alstare Corona Extra
22, Stefano Cruciani, ITA, Kawasaki ZX-6RR, Team Kawasaki Bertocchi
23, Broc Parkes, AUS, Honda CBR600RR, Ten Kate Honda
24, Matthieu Lagrive, FRA, Suzuki GSX-R600, MOTO 1
25, Giovanni Bussei, ITA, Ducati 749R, SL Racing
31, Karl Muggeridge, AUS, Honda CBR600RR, Ten Kate Honda
37, Katsuaki Fujiwara, JPN, Suzuki GSX-R600, Suzuki Alstare Corona Extra
50, Steve Brogan*, GBR, Honda CBR600RR, IRT Honda Israel
57, Lorenzo Lanzi, ITA, Ducati 749R, Ducati Breil
70, Yaniv Peleg**, ISR, Honda CBR600RR, IRT Honda Israel
76, Max Neukirchner, GER, Honda CBR600RR, Team Klaffi Honda
77, Mark Stanley, AUS, Yamaha YZF-R6, MSR Liscycles.com
93, Christian Kellner, GER, Yamaha YZF-R6, Yamaha Motor Deutschland GMBH
99, Fabien Foret, FRA, Yamaha YZF-R6, Team Yamaha Italia

Wild-card riders (Nomination : MA)
74, Brendan Clarke, AUS, Yamaha YZF-R6, Nikon Yamaha Racing
75, Joshua Brookes, AUS, Honda CBR600RR, Castrol Honda Racing

* : replacing Yaron Salinger
** : replacing Eli Chen