Searching for sgd - r 16144 x 99 newcastle xt parts

A quick learner says:
Need this part that?s missing
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Tom from SWISCO responded:

I'm not really sure what part is missing. Could it be the keeper that the mortise lock hooks onto? You have the 82-238 mortise, but this is compatible with a few different parts. I have no way of knowing what your original is. The 89-030 is a common pairing but no guarantee.

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