The graphics card is soldered onto the motherboard as is the case with a lot of the laptop's unless you're dealing with top tier laptops with interchangeable GPU cards. As for your laptop's model number I think you've stated the wrong number, You should be able to see your laptop's model number as:
Toshiba Satellite L
xyz-abcd5(random alphanumeric text as example) listed
under your laptop's case.
Once posted we can give you a confirmation.