Collider2D Resize Based on Sprite Using Generics

Generics are great, but sometimes they're puzzles to code. This is one of those cases, when the answer might be obvious, but I can't find it. So... That's my problem:

The Problem

I need to resize LOTS of BoxCollider2Ds, CircleCollider2Ds, etc... During runtime, but it would take time to write it on all of them, so I've decided: I'll make an Extension via Generics!

Oh well, the world was all in colors, 'till I tested it. The Colliders2D were not being resized!

But why? Because I am using a Generic where T: Collider2D? Because I can't access the size component without a temp? Because I can't set Collider2D.bounds?

The Script

 public static void RescaleToSprite<T> (this T collider) where T: Collider2D
 {
     if (collider is BoxCollider2D)
     {
         Debug.Log("Workin'");
         Vector2 newSize = collider.gameObject.GetComponent<SpriteRenderer>().sprite.bounds.size;
         var tmp = collider.bounds;
         tmp.size = newSize;
     }
                     
 }

Well... If someone knows what am I doing wrong, please tell me.

Thanks in advance.