I need to replace the 2 rear wheel cylindrs on my 84 z. I was looking at parts online & they list ones with "US standard threads" and ones with "metric threads". short of crawiling under to check is there a way to know for sure what I have? I assume they are referring to the threads on the brake lines. thanksfor any info.

 

82-87 3rd gen cars had US standard threads for brake lines and later models went metric.

 

i just did my wheel cylinders and napa said my car required a metric wheel cylnider with a bubble flair. but yours might be different.