Okay, once again the depressing math behind a 7.37% drop chance. This means you have to do 30 (thirty) bounty 1 bounties to have a 90% chance of at least one drop of Gara's chassi. And it also means you have to run another 30 (thirty) bounty 2 bounties to have a 90% chance of at least one drop of Gara's systems. And you might have guessed it, another 30 (thirty) bounty 3 bounties to have a 90% chance of at least one drop.  Thirty each is 90 bounties altogether ... to have a 90% chance