I have a Feb 11 1942 slat grill and I have chosen (what I think to be correct) lustreless Olive Drab #319. I had some new old stock rear lamps still in their protective coating (cosmoline?) so I got a local automotive paint supplier to analyse it and mix it up for me, after a few test sprays and re-mixes I finally found the colour and shade I was happy with.
This is an interesting read http://wwiijeepparts.com/Archives/WWIIJeepHistory.html#G503ODJeepPaint
I think a few folks make the mistake of taking the word 'lustreless' to the extreme and get their paint mixed up dead flat (matte?), if you look at some historical photos of new Jeeps they in fact have a slight sheen to the paint.
Of course this is totally up to the restorer, if your don't intend on building a factory fresh Jeep then flat would probably be more appropriate, the original paint finish would have oxidized and faded rather quickly in service.
This is an early '42 MB, note the slight reflection on the dishes of the wheels, this would be a new Jeep of course for this promotional photo.
I've heard many great comments about these guys http://www.tm9ordnance.com/products.asp#
, looks like a top quality product and they'll also send you sample plates.
At the end of the day, the colour and shade is totally up to, you have to be happy with it, correct or not.
Next time you go to a military vehicle event or show, take note, they're all different!