hi,i've got a leaky gearbox(94 micra 998cc) checked under car and reckoned the leak was coming from the selector shaft,phoned nissan parts for a oil seal,the guy at the parts desk couldn't find the part and reckoned the oil seal dosen't exist,can anyone out there tell me if it dose exist(i'm sure it dose it gives instructions in the haynes manual how to replace one)and if anyone has a part number that would be great. thanks john.