Welcome aboard Dervin!!
What is the make and model of the icemaker?
Porthole screens are Bomar, however I haven't found screens for those hatches in years. We make our replacements. We take black flexible black cutting board material and make two frames, then contact cement a screen between the two frames and cut the frame to shape. Hopefully, you have one left.
I'm not sure about the sliding door gasket.
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