07 Superduke shifter oil leak

Have an oil leak on my 07 super duke where the shifter bolts right at the case in to the transmission. Need some info is this is something simple I could change out myself?
Also is this the correct seal 0760142460 SHAFT SEAL RING 14X24X6 B?
Parts diagram isn't the easiest to read for this part of the bike and I can't seem to figure out how to add pictures to my post.

Aye, that's the one but are you sure it's not the gear position sensor o-ring that's failed - more common fail than shaft seal and easier to replace......

Oh it may be the o-ring. Do you know the part number?