I´m also working on this kit right now. There doesn´t 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 isn´t 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 don´t know how well these fit the Dragon kit though.
Hope this helps.