Hopefully Neff's still got a couple Cuper Aluminum tops. You're gonna have to ask him. As for a Delrin top, you'll have to talk to MrYo. He makes them and he actually just finished packing the first shipment for the people that sent in their money since last week. I don't know if he'll be making a second set so you can just message him and ask. He's got an amazing variety of colors and from what I hear his tops are extremely well balanced. Can't wait til mine comes in in a couple weeks
You might wanna check the price. I believe one of those cuper ones can go about 40 bucks I think if I remember correctly. As for the delrin it was 70. Both those prices not including shipping.