Good Question !
I did not check on the size difference .
I saw 596907 on ebay .
Why would GM have two different sizes for the same part # ?
I sure as heck don't know .
Call one of the other parts sellers & get one of their GM NOS bushings & have them check the size .
I'll leave the post right there .
Maybe someone else can figure it out .
I just went to ebay , I see the bushing is listed as: 2W - 596907 .
Was there a GM part # like that ? I think NOT .
I just sent the seller on ebay a question asking him to measure the bushing length .
I'll post back if he answers me .
Maybe the number on the box is worn ? Making the 9 look like a 7 ?
George
'54 3600
Last edited by '54 3600; 03/03/2018 3:28 AM. Reason: add