Fuel tank door lock?

So the other day I came out side to see the gas tank door open. I thought I was broken into to take some gas but no. I think I might have broken it off.
I went to the junk yard and could not find anything. I've been looking online but have not found anything since I probably have the wrong name for the part.
It's just the plastic that latches on to the inside and it won't let the door open. The still goes in and turns but there is no lock on it anymore.
I'm on my phone posting this later I will try to put a picture on here so you guys can get a better idea.
I'm trying to replace just the lockin part
Thanks

 

Hey guys so i took the cylinder out and i sort of disassembled it the plastic i need is just the latch.
When i went to the toyota parts center they said that the part would have to come with the cylinder and new key. totaling up to somewhere between 70-75$ The part number is

$73 69058-35140 Toyota Cylinder & Key Set - 69058-35140

69058-35140 just in case anyone want to know.