Gearbox drain plug

Hi,

Im hoping someone could confirm the size of the drain plug?
I was looking to get a gold plug for my sump, so thought I'd get one for the gearbox too since I plan on a change of box oil in the next couple of weeks.
Everywhere I have searched at work points it out to be a m16 with a 1.5mm pitch. And I've even checked the renault catalogue I have access to, and rang renault to make sure I wasn't being special and to to confirm it. That too said it was a m16 x 1.5.
I can't remember who it was, but they had bought a gold plug of this size and it didn't fit it was too small, so I'm a bit unsure of what to do/which to order.

 

sorry for any confusion. Should have mentioned what model lol.
Thanks for the input, the likely hood is it'll be an 18mm thread as you've said Matt. I'm sure they wouldn't just make one odd one haha. So I've ordered an 18x1.5 and a 16x1.5. Worst comes to worst I need to sell the 18mm one. Or if it is that least I can keep the smaller one for the engine sump. When I do that later in the year.

 

My gold plugs turned up quicker than I thought, so I had a bash at the gearbox oil today

i can confirm it is a M18 x 1.5mm thread. I ordered an AP-05 which fit perfect.

Cheapest place I found was scoobyparts.com too, £16 delivered with next day post. They are also looking to reduce the postage further from £3.95 with longer delivery times, like a 3 day option.