These are genuine Suzuki OEM valve seals used extensively on many models from 1985 to current models including DR's, DR-Z's, LT-Z's, GSF Bandit's, GSX Katana's, and GSX-R's.  A partial listing from 1986-2001 is listed below.  Seal dimansions are 4.5mm X 10mm X 8mm.

1986     Suzuki     GSX-R750   
1987     Suzuki     GSX-R750    
1988     Suzuki     GSX-R750   
1988     Suzuki     GSX1100F KATANA  
1988     Suzuki     GSX600F KATANA  
1989     Suzuki     GSX750F KATANA   
1989     Suzuki     GSX-R750    
1989     Suzuki     GSX1100F KATANA    
1989     Suzuki     GSX-R1100    
1989     Suzuki     GSX600F KATANA   
1990     Suzuki     GSX750F KATANA    
1990     Suzuki     GSX-R750  
1990     Suzuki     DR250S   
1990     Suzuki     GSX1100F KATANA   
1990     Suzuki     GSX-R1100    
1990     Suzuki     DR350S   
1990     Suzuki     GSX600F KATANA   
1990     Suzuki     DR350    
1991     Suzuki     GSX750F KATANA   
1991     Suzuki     GSX-R1100    
1991     Suzuki     GSX-R750    
1991     Suzuki     GSX1100F KATANA    
1991     Suzuki     DR250S    
1991     Suzuki     DR350S    
1991     Suzuki     GSX600F KATANA    
1991     Suzuki     DR350   
1992     Suzuki     GSX750F KATANA 
1992     Suzuki     DR250S    
1992     Suzuki     GSX-R750    
1992     Suzuki     GSX1100F KATANA    
1992     Suzuki     GSX-R1100    
1992     Suzuki     DR350S   
1992     Suzuki     GSX600F KATANA  
1992     Suzuki     DR350    
1993     Suzuki     GSX750F KATANA   
1993     Suzuki     GSX1100F KATANA  
1993     Suzuki     DR250SE
1993     Suzuki     DR350S    
1993     Suzuki     GSX600F KATANA    
1993     Suzuki     DR350    
1994     Suzuki     GSX750F KATANA    
1994     Suzuki     DR250SE    
1994     Suzuki     GSX600F KATANA    
1994     Suzuki     DR350    
1995     Suzuki     GSX750F KATANA   
1995     Suzuki     DR250SE    
1995     Suzuki     DR350SE    
1995     Suzuki     GSX600F KATANA   
1995     Suzuki     DR350  
1996     Suzuki     GSX750F KATANA   
1996     Suzuki     GSF600S BANDIT    
1996     Suzuki     DR350SE   
1996     Suzuki     GSX600F KATANA   
1996     Suzuki     DR350   
1997     Suzuki     DR350   
1997     Suzuki     GSF1200SA BANDIT   
1997     Suzuki     DR350SE    
1997     Suzuki     GSX600F KATANA   
1997     Suzuki     GSF600S BANDIT   
1997     Suzuki     GSF1200S BANDIT   
1997     Suzuki     GSX750F KATANA    
1998     Suzuki     GSX600F KATANA    
1998     Suzuki     GSF600S BANDIT    
1998     Suzuki     DR350   
1998     Suzuki     GSF1200S BANDIT   
1998     Suzuki     DR350SE   
1999     Suzuki     GSX600F KATANA  
1999     Suzuki     GSX750F KATANA 
1999     Suzuki     DR350SE   
1999     Suzuki     GSF600S BANDIT  
1999     Suzuki     DR350    
1999     Suzuki     GSF1200S BANDIT    
1999     Suzuki     GSX1300R HAYABUSA    
2000     Suzuki     GSX1300R HAYABUSA  
2000     Suzuki     DR-Z400E   
2000     Suzuki     DR-Z400 
2000     Suzuki     GSX750F KATANA    
2000     Suzuki     GSF600S BANDIT    
2000     Suzuki     GSX600F KATANA    
2000     Suzuki     GSF1200S BANDIT   
2000     Suzuki     DR-Z400S
2001     Suzuki     DR-Z400 
2001     Suzuki     DR-Z400E    
2001     Suzuki     GSF600S BANDIT  
2001     Suzuki     DR-Z400S
2002     Suzuki     DR-Z400S
2002     Suzuki     DR-Z400E
2003     Suzuki     DR-Z400S
2003     Suzuki     DR-Z400E
2004     Suzuki     DR-Z400S
2004     Suzuki     DR-Z400E
2005     Suzuki     DR-Z400S
2005     Suzuki     DR-Z400SM
2006     Suzuki     DR-Z400S
2006     Suzuki     DR-Z400SM
2007     Suzuki     DR-Z400S
2007     Suzuki     DR-Z400SM
2008     Suzuki     DR-Z400S
2008     Suzuki     DR-Z400SM
2009     Suzuki     DR-Z400S
2009     Suzuki     DR-Z400SM
2010     Suzuki     DR-Z400S
2011     Suzuki     DR-Z400S
2012     Suzuki     DR-Z400S