I recently purchased an Ericsson Mouthpiece for the antique KTAS Danish phone I have been refurbishing. It is also perfectly compatible with the antique Danish JYDSK phones. The mouthpiece is an ideal match with the originals in every way except for a seam where the two plastic halves were joined. I don't consider that to be significant, however, to the overall appearance of the finished phone. Very pleased with the mouthpiece, the price and the prompt service from the Old Phone Shop.
Ericsson mouthpiece older style. Many of these are broken. It comes with threaded metal insert.