A tsangan can include more caps, but it depends on what set you wish to fit on which keyboard. As it stands, his sets already come with a stepped off center caps, so there isn't really anything more necessary at the basic level than a 7 spacebar and 1.5 mods.
I don't believe those are from the same maker as his sets are. The edges are rounded on those caps where his step have sharp edges. They may be intended to do the job, but they don't seem to be a perfect match to me.