David, there have been previous discussions on front sight height
Do a search on "front sight" and then look through those threads.
I can tell you that P38 front sights will fit the dovetail and they come in several different heights. These sights have a good square front sight picture so if your Luger is a shooter and not a collector you can square up the rear notch from the 'v' that it currently is and make a marked improvement in your sights, but don't try this at home with a matching number collector's item please...
If you choose to keep the rear sight as a V-notch, and use a P38 front sight, once you have the correct height you can thin up the front sight to the same inverted V profile of a Luger front sight...
regards,
John
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