Pic Rail.....Odd Question

[Dmay]

I have a piece of Picatinny rail mounted permanently into an aluminum stock extension. It's for mounting a bipod. Without a lengthy explanation, it can't be removed.
I need to extend it down.....as in make it "thicker" to accomodate a different bipod.
Is there such a thing as a rail that will bolt to Pic and still be Pic on it's bottom (in this case) side? (Hope my explanation makes sense]

I believe I have seen such a thing, but can't find now.......

 

[Dmay]

Never mind! I'm a dumbass. Riser was the word I needed......found several of them now.....duuuhhhh

 

[vagrantviking]

Hard to find things like that if you don't have the right term. Been there a few times too!