Shoei have started selling their G43 butt plates:
Dear Friends, Thank you very much for your continued patronage. We manufactured G43 butt plate which had received many requests, and started the sale. The price is 10,000JPY. We prepared the lid of two types (a stripe pattern and plain).
When there is an order, please tell me about it. We are waiting for your order. I am looking forward to hearing from you soon.
Thank you always. Greetinga from Japan. Best regards, Tomio (Shoei)