Here's my counter:
"I am grateful for your desire to get this worked out, but I just got your message and I thought I should send you a picture of the two parts side by side that will highlight the obvious physical differences. Take a look. I have also talked to a number of experts who say that in addition to the pot and and the temp sensor, there is an internal fuel pump safety contact in the AFM that will keep the bus from starting if the flap is misaligned. I have spent hours verifying that it is not an issue with my bus. My OG part works fine. Your replacement is DOA. Whatever the case, I did not get the part that I ordered form you and I am not going to get into what is potentially weeks of back and forth with the re-builder where I am off the road more than I have already been. Especially when the re-builder told me to send it back to you! There are several other part stores that have rebuilt 410020s in stock that I can get in days. Ones that they will stand by. So, take a look at the side by sides and then do what it takes to send me a return label and refund me my $225.95 so I can order the right part from someone who will get it right and stand by their stuff. I know that I have spent over 2K at Bus Depot over the last few years so this experience has been unfortunate and unbelievable. At least you can still make it right before you spend $225.95 for the worst and most widespread kind of advertizing possible in addition to loosing a once loyal customer with $$$ to spend."
Haven't heard back yet.