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I still think it looks like a 10BP4 would fit; I'd have to try one, since they are pretty easy to find.
A friend gave me a 10BP4 to try. The neck fits in the yoke, but it is too big-a-round for the front support. Even if I modified the front support, the 10BP4 would stick out way beyond the controls and make them inaccessible.
I might be willing to buy a complete set to obtain a 8AP4, if the price is right. What sets use an 8AP4?