Earl's Repair Shop. He is the foremost supplier on German Walther parts, pistols, etc.
He travels to Germany a few times a year to bring stuff back (all genuine Walther). He's a bit pricey, but you'll have to pay it to get want you want, especially "white" plastic PP-PPK/s grips. He has them. Saw them on his site last week.
Do a search for "Earl's Repair Shop" and follow the links to the service pistol page and click on "grips".
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