[urq] Cast steel control arm question

[DGraber460 at aol.com]

How heavy are the cast parts, and are the considered an upgrade? Are  these a 
bolt on, or do you need to switch lower ball joints etc. Forgive my  
ignorance and all the questions, but I had not heard of these  before. 
I have always been a fan of cast as opposed to stamped steel. You  never know 
if stamped part is bent, tweaked, or straight.
 
Dennis
Denver