Update,i just recently had some poly bushings installed and so far the squeek has disappeared that bugged me last year from the o.e ones and i bought the 21mm ones and the install went w/o problems,fitment etc and yes the bar is the factory one

 

okay

 

So. are you saying the car has the LE1 option?????? Or someone before you replaced the 19mm bar with a 21mm???

 

Thats what I was thinking. I know my z28 didn't come with a 21mm bar stock, I had to make a phone call to Spohn for that to happen.

 

My r.p.o sticker in the glove box doesn,t list 1le on the codes and the original owner didn,t change the bar so it is the original one but when i gave my vin # to a GM parts dealer in AZ and the suspension code he told me i need the 21mm bushings.