Hi Mark,
The F-2100 came with two blade holders that were interchangeable, while the F-2200 came with only one on the bevel side that is of the same design. The straight magazine holder is unique on the F-2200. Regardless, the 2 or 1 with each machine, means that seldom would a framer depart with them unless the machine was being trashed, in which case it is unlikely that the magazines would be in pristine condition.
As Cliff suggested, I would recommend contacting Fletcher-Terry directly to order additional magazines.
Years ago, a German museum ordered about 3-4 extra blade magazines, so that each could be calibrated to a unique depth. They actually applied a small amount of lock-tite on the blade adjustment screw at the rear so that once set, other users would not mess with the settings! :sneakiness:
I am guessing that this is a similar motive for you, or perhaps you acquired a used machine where the magazines went missing?
Regards,
John