Plastic Bed! Tie downs info? Torx bit size?

So I guess nobody has filled the obvious Niche market for people that would like to add tie downs to the floor of the plastic bed. Seems like a corrugated backing plate to fit the existing bed shape would be great! Anyhow, I keep getting the same answer, so I will just throw money at Toyota and get some to add at the bed bolts. Would anyone happen to know the Torx bit size for those bolts?

 

http://www.tacomaworld.com/forum/technical-chat/4838-cheap-free-mods.html#post45406

 

Actually a thread on page 3 - LINK. And many, many more...

 

Thanks! lots of options in those extended threads! Too bad I can never make a search function work myself. And, T55 is the size!