I have a set screw tub spout, but the hex top broke off. So we cut the tub spout off starting farthest away from wall. It had a gray plastic tub attached to a copper pipe in the wall. However, When I opened the new one's it appears the Peerless one's are a screw on type, as there was no plastic interior even remotely resembling what I had. I looked at the box again and no where does it say it's screw on. I really like the combination that I have bought for the remodel of the bathroom and definitely don't like the other one I had as it was just plastic really cheap. Is there way I can modify my connection to make this tub spout work?

Thanks