Observed vertex buffer formats:

(Presumably the format is a bitset indicating what elements are present.)

138 <0000000010001010>: 16 bytes

    Unknown
    
3018 <0000101111001010>: 32 bytes

    D3DVERTEXELEMENT9[] =
    {
        {0, 0x00, D3DDECLTYPE_SHORT4,   D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_POSITION,     0},
        {0, 0x08, D3DDECLTYPE_SHORT2,   D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_TEXCOORD,     0},
        {0, 0x0C, D3DDECLTYPE_SHORT2,   D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_TEXCOORD,     1},
        {0, 0x10, D3DDECLTYPE_D3DCOLOR, D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_NORMAL,       0},
        {0, 0x14, D3DDECLTYPE_D3DCOLOR, D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_COLOR,        0},
        {0, 0x18, D3DDECLTYPE_D3DCOLOR, D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_FOG,          0},
        {0, 0x1C, D3DDECLTYPE_D3DCOLOR, D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_PSIZE,        0},
   };

3034 <0000101111011010>: 40 bytes
    
    D3DVERTEXELEMENT9[] =
    {
        {0, 0x00, D3DDECLTYPE_SHORT4,   D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_POSITION,     0},
        {0, 0x08, D3DDECLTYPE_SHORT2,   D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_TEXCOORD,     0},
        {0, 0x0C, D3DDECLTYPE_SHORT2,   D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_TEXCOORD,     1},
        {0, 0x10, D3DDECLTYPE_D3DCOLOR, D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_BLENDWEIGHT,  0},
        {0, 0x14, D3DDECLTYPE_UBYTE4,   D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_BLENDINDICES, 0},
        {0, 0x18, D3DDECLTYPE_D3DCOLOR, D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_NORMAL,       0},
        {0, 0x1C, D3DDECLTYPE_D3DCOLOR, D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_COLOR,        0},
        {0, 0x20, D3DDECLTYPE_D3DCOLOR, D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_FOG,          0},
        {0, 0x24, D3DDECLTYPE_D3DCOLOR, D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_PSIZE,        0},
   };