Ive had a good look to see what I could find and as far as I can see it isnt a D so unless anyone knows any different then I would assume it is just the F. I will keep looking though
I would expect that you would be able to build an E-3D out of it, same CFM-56 engines for both variants, and I would guess that the E-3F might just have an extra sprue of bits for the -F variant.