I think you can order it in that size yes.
I ordered the 18 mm and tapped out the stripped threads. Hole size was perfect so i didn't have to drill it.

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2006 Libby Sport CRD
Future vegi burner!

Either way you go, you will not be disappointed in putting on a drain valve. I used the Fumoto when I first got my CRD in '06 and liked it so much, I immediately got one for my semi truck. As has been said, one of the best investments you can make for any vehicle or equipment.

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Environmentalist Green + Socialist Red = Facist Brown

2006 Liberty CRD, Frankenlift II, Al's A Arms, Moog LBJ's, GDE tune, Etechno GX3123 Glow plugs, Fumoto drain valve, Elephant hose CCV mod.

I put one on my Ford F-350 last week.

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2006 Libby Sport CRD
Future vegi burner!

What I did was: I bought a Trasko.usa drain valve complete that cost about $30.00 bucks I use the M3 (SD4) and I install it, that is one shot deal, unce is there you will never take it out. It works gooood and is very low profile and it will never leaks and it will never have an accident of loosing the oil.

I also use their filter too the 10S 3/4 x 16 (ford thread).