[TW 2013] Body armor and Trama plates

[Michael Lewis]

I'm using the basic load from TW2000 for my TW2013 characters. What would be the equivalent flak jacket from TW2000 in TW2013?

Did they not have trama plates back then?

Do you think trama plates are too effective for beginning characters in TW2013?

What about knock down and stunning? Would a rifle bullet knock down and stun a PC if he was hit wearing trama plates?

It says they it covers the chest and upper abdomen (20%). Does that mean you roll percentile dice to see if a bullet hits or that's just the chance on the random location chart its going to hit those body parts?

Thanks