You you intend to made a shadow box with your grampa medals, I think that he was also elegible for the WWII Victory Medal and the Army Good Conduct Medal.
For criteria check here:
http://en.wikipedia.org/wiki/Good_Conduct_Medal
http://en.wikipedia.org/wiki/World_W...ited_States%29
Depending on where he served after the war, he might also be elegible for the Army of Occupation Medal.
Considering only the four awards, your Grandpa's medals would look like these:
Douglas