Looks like I need to call Coldsteel and see what's going on.
update: no response to email, and they're not answering their phone. No problem, I'll just bandsaw it down the middle and weld it back at the correct width. Considering all the other welding that has to be done it's not that big of a thing.
Next time I need a 1.6mm receiver I'll just bend my own blank. <sigh>