Can anyone tell me the tread size and where to get good replacements?

 

autozone, NAPA etc. any parts store will have them.

 

I tried a few of the parts stores in my area and they did not have them or list the thread size. I also tried local Chevy dealer and I would have to order it from 2 states away.

 

It's M10x1

I just went through this. You best bet is to call every parts store in the area and tell them to match screws to a set of brakes that they have sitting on the shelf.

I got lucky and a Lee Auotparts had a Lt1 caliper on the shelf and matched part of a bleeder screw pack to the calipers.

~Jim~