Hi Chris, what is the fingerboard it looks ebony ?
Binding doesn't cost that much, the postage will probably cost about as much so I'd order a white, black and cream strip, at least you can make that decision when it's mocked up.
Nothing worse than trying a colour on there and thinking I should have ordered another colour.
You can even get pearloid red binding looks cool on some of DB's builds.
There are many different sizes to order so make sure the height is at least fingerboard height, preferrably a bit higher.
Thickness you just have to estimate but I'd go slightly thicker than thinner ones are much easier to sand through or crack because they are sanded thin