Got a reply from the ebay mud flap seller (and they refunded the remaining 50% of the price I paid for the flaps I kept so I got the flaps for free):
"Hi, dear, we are sorry for the problem, and we will refund the remaining fee to you. The flaps need to be improved, and it may take a long time to wait. You can leave your email address. We will notify you by email as soon as it is available. You can order at that time if you are still interested in our products.Thank you for your understanding.
Best regards."
I gave them my email address and told them exactly what needed to be revised on the new version. We'll see what happens...
Well, darn. Oh well, hopefully it doesn't take too long to get it right!