rank's dimension

[Barbara1]

hello all
i would like to change the dimensions of the "rank" (admin.png, moderator, member etc),
but i dont know where these settings are.
the path to find those, and change the pixels dimensions so i can use my own images.

for example, this image is one of the set i have created

the dimensions are 279*58.
my VB (4.0.6) gives me as highest width-height available, the: 170*40 pixels. (i have found that by tests)
how am i able to change that?
is it possible for someone to help me in this plz?

thanks in advance for the replies

(i am totally new in Vbulletin)

edit:
problem solved.
you may delete this post.