OK, here is the situation as near as I can put it together.
The magazines will not work in Flint's conversion. Here is the website that he pointed me to http://hahn-precision.com/armory/a_armory.htm. They have some drawings there about converting UZI magazines and mention a cut at the back of the mag to clear the bolt catch. These magazines do not have that cut.
The Colt 635 that I have access to is 1200 miles away so I can not confirm if this is an issue in Colts or not. I will not be getting back there for 6 weeks or so.
The magazines are exactly as pictured above.
If you have funds en-route to me and want to back out of the deal based on this, I understand.