Exterior interlock bracket for 3 panel Anderson

A contractor from Castine, Maine says:
Door is circa 1986
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Casey from SWISCO responded:

Hello,

Take a look and compare the specifications of the 82-048 latch mechanism to your part. Thanks for posting! 

A contractor from Castine, Maine says:
The latch seems to operate. Is there a missing bracket that interlocks with a corresponding bracket on the stationary unit? In the picture there seems to be two mounting holes for some hardware,
Thank you.
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Casey from SWISCO responded:

We carry two Andersen interlock brackets, the 82-057 and 82-058 . Take a look and see if you think one of these parts might be what you need. 

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