I've seen pictures and diagrams of many Ju-87-D3 and up with sirens. At least they were labeled that way, and they looked like D models to me (The D and B model actually look different, so that parts pretty easy to tell, whats tough is distinguishing between D models). The pictures could have been mislabeled, I don't know. I really don't care to much about the siren, I guess I'm in the minority on that.
SW- The 109E was fitted for an engine mounted 20mm MG/FF firing through the spinner, but I don't think any were actually made that way. Actually, Galland may have had his modified, I know he had a couple 109s modified as 'one-offs' with more firepower than the standard ones. As far as I know, the supercharger intake was on the side of the nose, not through the spinner.