I just received an email from MRI-Denver about my order placed in August. Seems that they are cancelling all pending orders and issuing refunds.
"We apologize for our continued delays and the inconvenience that it has caused.  At this time I am going to process refunds for all orders that have not been sent.  When the item you ordered becomes available, I will contact you to see if you would still like to purchase."

I also came across these items on Amazon that are similar:

https://amzn.to/3aCJ3Yi
https://amzn.to/2KUAVYh

Happy Holidays to all.

I got the same email as CynicalZombie! I'm hoping Santa shows up with my order!

Here's a link to cables on Amazon.

https://amzn.to/39ECST6

I've tried but haven't found another source. I ordered a "Universal MTX Deck Plate" back in August for my RadRover 5 and haven't received it yet. The company has emailed me several times asking if I wanted to cancel.I'm trying to mount a Topeak bag to my factory rear rack and really don't have any other options. The Topeak adapter seems to be out of stock everywhere.

I got mine in August!

Although this really doesn't answer your question I'll explain my experience. Just by luck I was checking the website on 9/10 and saw the orange rack was available. I quickly ordered it, checked the website again a few minutes later and saw the black rack was available. Immediately called the company and tried to switch colors and was told that both racks were sold out. I had signed up for email alerts but never received one. My orange rack arrived a few days after I placed my order.

Bike arrived two days ago. Today was the first day without rain so off I went! Couldn't be happier with the purchase.

Just got my shipping notification! Ordered my RadRover 5 on 6/18. It should be here in a week.