Litework, I found those stocks at the gunshow in The Showplace (Richmond) years ago. I don't remember the manufactor, but I pulled them and they have a model or size number of "12" handwritten inside. I will continue to hunt around and if I find out who made them I will pass the info along to you.
I haven't seen any like them since as I wanted a set for my Python. I remember the dealer only having a few pairs and they were for the Anaconda and King Cobra grip frame. It was just one of those lucky finds as there weren't many wood stocks available for the Anaconda at that time.