Andersen Shoe or Retainer clip?

A home owner from WI says:
April 20, 2020
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:
April 22, 2020

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. 
Awning Operator Kit, Long Arm
Awning Operator Kit, Long Arm
39-389
$85.20
Awning Operator Kit, Short Arm
Awning Operator Kit, Short Arm
39-390
$82.70
Casement Window Handle, fits Andersen
Casement Window Handle, fits Andersen
39-286
$7.25
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