drive shaft seal

[billythefish]

I need to replace my n/s drive shaft gearbox seal which is leaking, how do I go about this as my Haynes manual does not cover this area in great detail, plus where can I buy the new seal and is there a O ring as well as the seal to replace, if so what size please.
thanks in advance for any one replying
billy

 

[billythefish]

Problem solved, my drive shaft is no longer leaking an old boy that used to be a Renault mechanic has fixed it.
Thanks to all those that thought about replying.