If you're referring to the 128x emblems if it's possible or not, I speak from experience that I made the clan page display 256x emblems, you just need to change the max size of the emblem in the xml via moving things around. And of course change the file uploading changes to reflect on the new max size.
I did that for Hymn's long dead server back in 2000s. 256x is pretty massive, so 128x is a nice medium so we dont have to see upscaled and nasty looking emblems but make sure to change the xml file or it won't do much good and if you dont, it will still upscale or downscale on the clan page.