Biggest standard head

I'm wondering which of the standard DD heads you can buy at Volks USA is the biggest one? I have heard of DDH-01  is there another head that is big too?

Thanks

I have DDH-10 and DDH-22 and they both seem as big. I knew because the wigs are either too snug or won't fit them - they'd usually fit better in 9-10" wigs.

My DDH07 looks bigger than all my other ones. I have a DDH09, 01 and a Miku head and the 07 has a hard time looking good in a lot of wigs because of how big it is 

Not the most helpful, but I *can* say 03 and 06 are quite slim, so you can cross those off . 03 especially, 8-9 wigs are kind of loose on both of mine. The largest head I know of period is Rin Tohsaka.