Airbag ecu help needed
 

I need a replacement Airbag ECU for a year 2000 a4 2.4 auto. It has driver, passenger and side airbags. The audi dealer quoted me £440 for a new one with the code 8d0959655TB. I can't find an exact match on ebay but there are quite a few with the suffix L, K or J.

Does anyone know what the suffix TB means and can I replace the module with an earlier version (L,K or J) ?