Check if a specific collider is colliding

Hi everyone, I have a GameObject with two colliders attached, I’m not going to create a child gameobject to have the different collider there, I opted to have two different colliders Capsule & Box Collider. Now I’m trying to create a GroundCheck with OnCollisionStay but how do I get the ContactPoints of that specific collider (box)?

The concept would be.

void GroundingCollision(Collision collision)
{
      foreach (ContactPoint contact in collision.contacts)   <--- of only "BoxCollider"
      {
            //other stuff
      }        
}
void OnCollisionStay(Collision collision)
{
      GroundingCollision(collision);
}

Try this:

BoxCollider _boxCollider;

void Awake()
{
    _boxCollider = GetComponent<BoxCollider>();
}

void GroundingCollision(Collision collision)
{
    foreach (var contact in collision.contacts)
    {
         if (contact.thisCollider != _boxCollider) continue;

         //other stuff
    }
}