2003 Hyundai Atos battery terminals

I live in Anguilla, a carribbean Island. I bought a Hyundai Atos from a rental company. Everything seems to work ok, except for the battery getting disconected very frequently. I realized that one of the battery terminals is not original. It was made of a piece of aluminum and it does not work correctly. I have to adjust it all the times. ¿How can I get that piece delivered from overseas? Please let me know, company name, address, phone, website, etc.
Thanks for your help...
Juan Karlo