If you want to go "purist", and put period grips on it, but still have them feel exactly the same as what you have on there; find some Mershons for it.

They are proper pre-war rubber, and essentially in the same shape as Pachmayr presentation because Frank actually bought Mershon.

They aren't exactly falling off tress like old Pachmayr rubber grips are, but they aren't too hard to find, and when you do find them you may only have to give a $5, if that, for them. The fun bit though is that if you put them on your gun and a purist sniffs at you, you can school em, and say that these *are* period correct!