Volvo 480 Club Europe

Can anyone tell me where the gear oil drain plug is/ what it looks like?
I can see two possibilities.

Thanks
Mat

this the one that takes same size adapter as sump plug, slightly different shape though, is slightly to front of gearbox. Prety obvious though.

There is a hexagon shaped nut with a 8mm square insert to aft of the car,(behind the selector from the gear stick),
Could this be it?

probably seem over cautious, I don't want to screw this one up thats all.

Cheers
Mat