You should be able to get the appropriate engines and gondola from AIMs. If I recall correctly, you might have to scoop a set of thin blade props from the Hasegawa Ju 88G or 188 kit. I believe Techmod has a sheet with A-1 or A-5 markings and Xtradecal's Battle of Britain sheet has an early 88 as well (I can not recall if it is an A-1 or 5). You would then be left with the rudder to deal with. A little gathering of goodies, but that should get you off and running.
Oh, and if there are differences with the exhausts, check through the Quickboost line, you might be able to use one of the earlier Ju 87 sets (I think the ones for the Italeri kit are what you may want).