I guess we've got two threads going here covering the same topic:
https://www.mobileread.com/forums/sho...d.php?t=185164
I'm sorry folks, it was late and I was frustrated.
In any case, the images don't need to be stretched as I can edit my original cover art source to do whatever I want. Yes, it's a hassle, but it would be worth it if I could take advantage of it, which Amazon no longer allows