I have pictures of the tombstones of the following Wittlakes that are buried at Woodlawn Cemetery in Columbia Falls. Not sure if they are related to you.
Fritz C. Wittlake b. July 25, 1866 d. March 24, 1909
Edward Wittlake b. Dec. 26, 1904 d. July 1, 1987
Fred Wittlake b. March 19, 1900 d. Oct 13, 1976
I do not live in Montana, but in the Seattle area.