Based on the original Brunei Darrusalem CIF by biocomp.pat and updated by lim2me as at http://www.ubercart.org/forum/internationalization/9465/cif_brunei_darus...
Their versions did not actually install on UC 2.X. This now installs correctly and has update support for anyone running their versions. There may need to be some updates to district names but I am not 100% sure on this.
I have updated this to version 2 and haven't had any problems running it on my sites now. I understand that Drupal 7/UC 3.X already has a Brunei CIF, but Drupal 6/UC 2.x doesn't.
If there is anything that needs to be updated, please feel free to do so. As far as I can see there is not currently a contrib page for it so thought I would put it here to make it a bit easier to find.