Your best bet with this is to take the old speaker with you to somewhere like radio shack and see if you can source a similar replacement speaker. It is highly unlikely that you will get an exact manufacturers replacement unless you find one of these units going for spares on Ebay.
You could also try this company (although they are presently closed until 1st Jan) as they supply near match replacement speakers for all GPS units. You can use the request/repair quote to describe your requirements. There is a very useful audio troubleshoot also at this link. http://www.sharc.net/gps_audio_repair.htm
Answers & Comments
Hi,
Your best bet with this is to take the old speaker with you to somewhere like radio shack and see if you can source a similar replacement speaker. It is highly unlikely that you will get an exact manufacturers replacement unless you find one of these units going for spares on Ebay.
You could also try this company (although they are presently closed until 1st Jan) as they supply near match replacement speakers for all GPS units. You can use the request/repair quote to describe your requirements. There is a very useful audio troubleshoot also at this link.
http://www.sharc.net/gps_audio_repair.htm
Hope this helps. Thanks for using FixYa