bonnet badge? - I assume you mean the Roundel emblem on the hood (bonnet) and trunk (boot)....they are the same size front and rear & don't forget to purchase 2 grommets, too...they are the little rubber "condoms" that help secure the Roundel in their respective holes in the bonnet/boot.

the 525i emblem - there are two different style "numbered" emblems depending on your car's build date (which should be located on the driver's door jamb). If your car was built before 7/1991 the 525i emblems are block style...build date 7/1991-up the 525i emblems are italicized. (by-the-way...the "525" and the "i" are two seperate pieces.)

If you go to the following link...scroll down to "emblem" and click on the diagram...it will open up into an exploded diagram with the BMW part number index below it....again remember to choose the correct diagram that corresponds to your car's manufacture date: http://www.realoem.com/bmw/partgrp.d...04&hg=51&fg=20