Before you do anything else, please use the flash utility and eeprom utility to make back-ups of your current firmware and eeprom.
I welcome anyone to correct me if this has changed, but LT models with that firmware were A drives.
Your choice of model cross-flash depends on what features you wish with your drive. You may use any of them. And please consider whether you really need to cross-flash the drive before you do so. No one can guarantee that you will be successful if you chose to do so.