PC Is there some filler blocks missing?

[Cyanide2029]

So i was building and once i got to the corners i couldnt find the filler block to fill this gap in the image below, It used to be called ramp corner filler or something, has this been removed or am i just not looking in the right area? Ive checked the block shape with wood frame but couldnt see it in there.

 

[Boidster]

Concrete ramp corner perhaps? I browsed through all 'concrete' shapes in creative and that seems closest. There is a wood frame 'ramp corner filler', but it doesn't look like it would fit smoothly.