How to check what block a player clicked on

I want to make it so that if a player right-clicks on a block of stone, with a certain item I made, that it replaces the block of stone with another block. Right now it will replace any block with the one I want. I want to make it so it will only replace the block if it is stone, but there is no block in the procedure maker that checks what block the block is. Please tell me if I'm missing it, or how to make this. I didn't put this under feature requests because I'm almost certain that there is already a way to do this I just can't figure out. Thanks in advance