Try ebay there is amob called efi hardware they have universal tb setups which look to be quite good quality all anodise links and adjusters.
or you caould buy motec tb's which are very good quality but can be complicated to set .
I would tryand use pairs of tb's rather than indervidual tb's.
try this link .
oz
http://cgi.ebay.com.au/ws/eBayISAPI....category=32624