Andersen Shoe or Retainer clip?

A home owner from WI says:
The yellow plastic part rides in a track and the hinge clips the operator arm. Can't find these anywhere on bye internet. Our operators are Andersen as far as I know.
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Dave Sr. from SWISCO responded:

I don't believe your Roto shoe and operator are available any longer. I couldn't even find the Anderson code number on the part. I can at least tell you that your window was made between 1955 and July 1959. I suggest taking a look at the newer style operators like the 39-389 or 39-390. I can't guarantee that either will work, and if they can then it would take considerable alteration to accommodate the new style. However we do not have a better option. I apologize for the inconvenience. 

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