Pella Storm Door handle parts

A home owner from Shelton, CT says:
Trying to buy replacement parts for my Pella storm door. The part that I really need is shown in pic-4. The whole brass assembly. The handle is not working because on the brass assembly the washer or holding collar appears to be worn or stripped. I would like to replace the whole assembly handle, lock but cannot find where to buy it. Your help would be much appreciated.
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Bob from SWISCO responded:

See our 40-058 or 40-177. Look over the dimensions and see if you think one of these sets could work for you. 

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