Butt pad question

[Tom]

Hi
I have been fooling with this old gun recently and have asked a few questions, thank you for all of the responses I hope I don't wear out my welcome.

The stock I have is from a DHE straight grip, it has an old rotten orange pad on it that I believe is original. I have been looking for a replacement and all the ones I've seen have a flat back where it screws to the stock. My stock has an arc on it and the pad I took off has a hard moulded plastic part that matches the stock and I'm guessing the orange rubber is vulcanized to that.

I have looked hard on the net and have not see a pad that has an arc moulded into it.
Can anyone identify this from my description ?

Thank you, Tom