I attached the images you sent below. For instructions on how to attach images to this forum (for future knowledge), please go here: http://www.inkjetmall.com/tech/content.php?152-How-to-attach-images-to-this-forum
After reviewing your order history, I see you purchased spare chips for your 9900 refill carts in May 2013. Please check any other 9900 chips you have to see if any other plastic bases have these two plastic tabs. Using a razor blade, carefully cut off the two plastic tabs as indicated by the photo below, so it fits into the space on the cart correctly.
Please let me know if you have further questions.
Happy printing~ Dana