Placing randomly sized objects side by side unity 2D - unity3d

Question

I am attempting to instantiate differently shaped prefabs next to eachother. I have a folder full of differently sized objects that allow for me to string them together randomly to create a 2D endless runner. My issue is that all the answers online about placing objects beside eachother don't work when different sized objects are used. Here is the code I am using to instantiate the sections. It works when it only randomly selects similar sized objects. When the selected prefab is a different length it leaves either a gap between, or overlaps, the previous object.
for(int i = 0; i < activeSectionsAtOnce; i++)
{
int index = Random.Range(0, sectionPrefabs.Length);
GameObject currentOb = sectionPrefabs[index];
Vector2 position = new Vector2();
if(activeSections.Count == 0)
{
//set a (0, 0) position for first object
position = Vector2.zero;
}
else
{
//get most recently placed object from list
GameObject lastOb = activeSections[activeSections.Count - 1];
//my attempt at getting bounds for the last object and for the next prefab that will be used
Bounds lasObbounds = new Bounds(lastOb.transform.position, Vector2.zero);
Bounds currentBounds = new Bounds(currentOb.transform.position, Vector2.zero);
//Include child objects(all have sprite renderers)
foreach (Renderer r in lastOb.GetComponentsInChildren<Renderer>())
{
lasObbounds.Encapsulate(r.bounds);
}
foreach (Renderer rend in currentOb.GetComponentsInChildren<Renderer>())
{
currentBounds.Encapsulate(rend.bounds);
}
//position object will be instantiated at
position.x = lastOb.transform.position.x + (lasObbounds.size.x / 2) + (currentBounds.size.x/2);
}
//instantiate at selected position
activeSections.Add(
Instantiate(currentOb, position, Quaternion.identity)
);
}
This is in the start method. I'm not sure if the problem is how I'm creating the bounds, or how im mathematicaly creating the x coordinate. This is the expected result that happens when I use same sized prefabs. This is what happens with different prefabs
The shorter protrusion from the first object should be cleanly between the other two without a gap.
Here's an image of one prefab
Thanks for any advice