I placed an order with Dreher about 6 months ago and got no responce . He eventually E mailed me that he had no stock and I should resubmit the order later.
Probably means he does not have stock in your case .
Would suggest you can get someone who speaks German to phone him.
Bill
If he can console you, I have the same from Ulis or Stemler. only reliable is Rabenbauer or Hugget for prewar parts.
I write many times to Ulis or Stemler but never reply to me