What is the part number for plastic assembly and cover

A quick learner says:
I have spring SK 407
User submitted photos of window hardware.
A quick learner says:
Thicknees is 7/8 inches and accurate meassurment shows 1-9/32 inches W
Plastic high is1-1/2
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Paul from SWISCO responded:
Thanks for posting. I've assembled a list of possible replacement parts for you that you can see on the right side of this page. Look them over carefully to confirm that they match.
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