I second the Nil-Griffe grips, the pair I have are outstanding and fit a 1914 DWM absolutely perfect.
I have bought many off the shelf Luger grips and the Nill's are the only ones I could ever recommend, don't waste your money on the cheep ones.
See post 14 and 31 of my thread here for pictures:
http://forum.lugerforum.com/showthre...hooter+refresh
Jim Solomon also makes fantastic grips from scratch for a great price. Those would need to be special ordered from him if he is willing to take on the job.
Nice thing about Jim's is you can pick the wood type used and checkering LPI.