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Here are a few early sets (I believe there are more) with these risers which may be second generation as I have seen red ones that are almost exact but it doesn't clip on the track simply sits between the sides. Notice that two of the pictured sets also have the wider brick risers we are use to seeing. The is also a picture of like an early elevation expansion set with the second generation slopes (there is one before these) and the risers. I believe I have also seen old new stock of these in manufactures plastic sleeve of ten or so.