I was wondering where I can find the bolt sizes for the lower control arms and trailing arms on my ek hatchback civic, I had to cut some out and need to replace them

 

online parts diagrams have em.

 

rear lower control arm bolts --> 90173-SR3-003 -- Bolt, Arm (LOWER) (10X80)

taken from here... https://www.hondapartsnow.com/parts-...lower_arm.html

 

What that doesn't tell you is the thread pitch (I think it's 1.25) and the metric grade of the bolt (I think it's at least a 10.9 if not a 12.9).

So if I'm accurate it would be M10x1.25 at 80mm length, partial threaded 10.9 or 12.9 grade.

 

can be found, if you have the right tool, with the broken bolt.

 

or that it's the same size as the other 2 volts that hold the strut to the arm and hold the arm to the knuckle

 

no, I meant getting the thread size.

 

If you didn't know the other two are basically the same bolt with only minor differences and depending on where the bolt broke, you may not be able to determine thread pitch, and only experience will tell you steel class.

I believe the bolt in question is a partially threaded bolt and if it's seized where it breaks above the threads, there is no threads to measure pitch.