We have genuine Suzuki OEM gaskets for the Clutch Cover of your Suzuki DR-Z400.
 
The clutch cover o-ring is the large o-ring for the outer clutch case, the one you need to check and eventually replace when doing a clutch job. (see picture for location)
 
O-rings don't last forever, especially if you ride in a hot environment, so it's a good idea to replace this critical seal once in a while!
 
This is a Suzuki Genuine Parts:
11484-29F00-000 O RING, CLUTCH COVER OUTER
 
Note: We also have the inner clutch cover gasket available here: Clutch Cover Gasket