As long as you dont tear the gsket, you will be ble to re-use it.....especially if you put a gasket paste - usually grey on it... thin smear each side.....
The rotor can be JB Welded in situ, you just need to wash it out.....just keeping the crap out of the sump....or pull it out if you aren't comfy with that...
Question....theoretically, the rotor should have suprseded to the 05 up rotor i thought.... which is lighter and helps the engine spin up quicker.....
Stupidly enough, looking up the part numbers 32102-16G00 (first version) fits all years, but 32102-16G10 (later part number) suits all years too.....
Suzuki do wierd crap hey.....and the lighter version is a lot dearer too.....