For reference, I guess this is the one you are talking about:
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Sad to say, there's no general way to "back port" a geograft between different Daz figure generations because the attachment vertexes will not be the same.
Unless the creator has put out a G8 version you are basically out of luck.
Meipe is pretty prolific, and if enough people (perhaps just one!) ask then they might consider doing a G8 version.
I did a bit of stalking and there were no obvious forum accounts or twitter/email/social etc contacts. However you might be able to get in contact via commenting on their DeviantArt page. Another way might be via contacting Renderotica feedback and ask them to pass a message.