Maybe it was an option, and my ski shop figured the stiffener made sense for the equippe level and pre-configured them that way.
The first SX90s were built without the external bar but the 'cuff' was very susceptible to being cut from ski edges.
There was a retrofit of a plate covered with a kind of think black primer type paint. It wrapped slightly round the edge of the cuff. Came with 2 small self tapping screws. Seem to remember that there was a metal plate in the cuff that you drilled into.
The ver 2 was riveted onto the cuff at the factory - a plate with two slightly raised strips fore and aft.
The boot in the pic is not from the first iteration, I think it's season 2 onward tho it could be that the design changed mid season.
Ver 1 is on the left
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