so the lower arm would be the most important out of the 2?...
cause i do want to fix my carbut at the same time i want tosave money and get anything i dont really really need...

 

true they are, however they could have been t-boned or severely rear ended, or many other things that would leave the parts he needs unscathed.

it takes less than half an hour to call a bunch of scrap yards to see if they have any wrecked XX-XX year mustangs. if they do, ask where the damage is done and ask if any would have the parts you need (they know about where the parts would be and they can tell u if they are salvageable)