Help with Name of Set or Sets

[Super]

Can anyone tell me what set or sets these gray Elevated Rail Risers came with? I have always ignored buying these as I didn't like the fact that you couldn't run track along and under them but I received a handful in a bulk purchase and love how they fill the gap of the elevated rails and are much narrower than the usual gray 3" risers. I would like to pick up some more and use them wherever I have elevated rails with none underneath. I know I have seen the sets but like I said always ignored them in favor of the larger, pass through ones. Oh, how I wish Tomy would come out with a combination of these risers that fill in the gap of the elevated rails and the pass through ones. That would clean up the layout nicely. Any help would be appreciated.