Robert, if you have an E/6 marked Simson grip screw, they are extremely rare. It recently took me over 2 years to locate a replacement for my Simson. Ed was the person that graciously shared one of the very few he has with me.
Ed Tinker is a specialist in Simson Lugers, and I am sure he would gladly supply you with replacement matched screws with the proper Whitworth thread profile for your Luger.
The threads on Luger grip screws are unique, so don't attempt to replace them with anything SAE or Metric.
Please contact me directly or contact Ed on this board if we can be of help.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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