anyway, doesnt matter.
goto the folder
C:\Program Files\Konami\Pro Evolution Soccer 2009\kitserver\img\cv09.img
if your ibrox stadium comes with 12 files, rename them to ibrox_330.bin, ibrox_332.bin, ibrox_337.bin, ibrox_339.bin, ibrox_344.bin, ibrox_346.bin, ibrox_351.bin, ibrox_353.bin, ibrox_358.bin, ibrox_360.bin, ibrox_365.bin, ibrox_367.bin
rename celtic_331.bin to ibrox_331.bin; and celtic_352.bin to ibrox_352.bin
then delete celtic_330.bin, celtic_332.bin, celtic_337.bin, celtic_339.bin, celtic_344.bin, celtic_346.bin, celtic_351.bin, celtic_353.bin, celtic_358.bin, celtic_360.bin, celtic_365.bin, celtic_367.bin
if it comes with 14 files, rename them to ibrox_330.bin, ibrox_331.bin, ibrox_332.bin, ibrox_337.bin, ibrox_339.bin, ibrox_344.bin, ibrox_346.bin, ibrox_351.bin, ibrox_352.bin, ibrox_353.bin, ibrox_358.bin, ibrox_360.bin, ibrox_365.bin, ibrox_367.bin
then delete celtic_330.bin, celtic_331.bin, celtic_332.bin, celtic_337.bin, celtic_339.bin, celtic_344.bin, celtic_346.bin, celtic_351.bin, celtic_352.bin, celtic_353.bin, celtic_358.bin, celtic_360.bin, celtic_365.bin, celtic_367.bin
to be honest, in the new file names, it doesnt have to be renamed to ibrox_XXX.bin, you can just leave them as unnamed_XXX.bin or qwertyASDF_XXX.bin. what matters it the _XXX.bin part. i just recommend renaming it to ibrox_XXX.bin for organizing purposes