Iīm also working on this kit right now. There doesnīt seem to be a dedicated set for the Dragon kit yet, but there are a few sets for the Revell kit out there. I used this product:
This set is the same as the Profikit product no 9215. The PE parts fit fairly well and it also isnīt that expensive. There are more comprehensive (and expensive) PE sets from Eduard and Part too, if you want more PE for the Panther D. I donīt know how well these fit the Dragon kit though.
Hope this helps.