I really like the black mesh Grillcraft model but was wondering if anyone knows of something similar that doesn't require making new holes in the B.

http://www.grillcraft.com/applications/2006_Scion_XB.aspx/1|7/253/

 

I don't know of any other mesh grills that fit your need unless you use zip ties and home depot it

 

depending on where it's being mounted i think you could get away with using zip ties and anchors instead of drilling...as long as the anchors have good adhesive on them that is...something kinda like this:
http://www.coolerguys.com/840556021568.html