how to inforce the migrator to set the same joomla article id

Hi
I have migrated the articles from joomla to easyblog , but the migrator generated new article_id for each migrated article.
I want to force the migrator to use the same old Joomla's article id , not to generate a new one.
thats because I have previously added the article_id to the joomla's articles links , and need to still have the same link after migration ,

please to guide me which file to hack and where exactly to find that part of code . also how to change it .