Auto box leaking final drive

The cork gasket on my final drive sump is leaking and it won't nip up.
I'm aware that there isn't a drain plug, so it's messy time.....but can't see the filler to put the new SAE 90 back in!
Someone tell me I'm being stupid....and then can someone else tell me the location of the filler plug.

 

Check the right hand side just to the rear of the drive shaft.

 

Cheers...due to offset garage door I always seem to be at the left/nearside...will investigate further....but not tonight.

 

003 box or 010 box

 

Later box...010.
I presume that like any gearbox, I fill till oil trickles out of filler hole.

 

New gasket arrived and now leak free...can I just say....I HATE the smell of gear oil !