If they're opening ports and they're plastic, chances are good they're Gray Enterprises ports. We carry them -- give us a call at 877-932-7245 and we'll help you figure out what you need.
Mine, I think, are Beckson. I have a 1985 P-34. I got Beckson screens ~5 years ago http://www.beckson.com/replace.html that fit just right. Gray Enterprises from Phil may also fit.
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