Yes, the J470 has a high back so it tapers from one side to the other. The problem is, the back half is lower then the front half so it sit's in the middle. And that is where all the threads are, so I'm worried it will ruin the threads and leak in a very short time. The tub is sealed good, so the cover is on good. It just doesn't look like the top is made right. I let my dealer know, but waiting to see what will happen.