Contact Walther. The new ppk/S mags may fit it.
Many years ago, I had a PP22. Of all the guns that I have traded and sold over the years, that PP is the one that I most regret selling.
During the years that I owned it, it made one hell of a dent in the rattlesnake population.
For those who have fought for it, freedom has a taste the protected will never know!
Or at least they did before political correctness