Heres something i made a while back in a 400ex forum
maxxis razr Xm has an 18x10x9 (18's look good on a 400ex as long as there are 19's on the front) But it's only a 2-ply
Razr Xc only available in 20x11x9, But 6 ply.
Razr MX rear also has an 18x10x9, 2 ply.
Rzar2 has only 20x11x9, 6 ply.
Razrs come in 20x11x9, 4 & 6 ply.
iRazr come in 20x11x9, 6 ply.
Razr iMX, 18x10x9, 19x10x9, 4-ply.
Razr Ballance, 19x10x9, 6-ply.
Razr Vantage, 19 and 20 x10x9
Okay, just my little search, i learned something.
↑ Theres what you've got for razrs.