I'v seen it done 3 ways.. replace 1, replace all and even seen 1 guy put the rod in a vise and straighten it and put it back in.!!!
I think Partsandservice is gonna be the expert on this thread, seeing he has the book.. maybe just PM him or send an email..
I know this site doesn't alert me when someone posts something new or sends me a PM.. I have to log onto the site and THEN I get a pop-up..
So, you might wanna try both and see which one gets answered faster.. I know email is faster for me..