1/35 detail sets

you could try Eduards web site http://www.eduard.com/
they do PE for the Stuka Du Fuss and loads more

If you're feeling brave you can try Aber..

Here's one I found on Great Models site, and it's in stock. But I don't know if it's for the Tamiya or the RPM kit. Good luck.

tim984, I have the stug IV from Tamiya and here is the detail stuff I picked up for it.
Eduard PE #35 357
Eduard Schurzen #35 361
Eduard Zimmerit 35 483
Jordi Rubio barrel and muzzel brake TG-05 (I would recommend getting the one from Eduard. The Jordi muzzle brake has a lot of flash and below my expectations.)
Academy's indy tracks for the Panzerkampfwagen IV comes with idler and optional drive wheels. (got this because the PE set wasn't hard enough on the eyes) I would of liked to have gotten the Friulmodel tracks but I blew my budget. If you do get these tracks becareful I think if you get the 40cm tracks you will also have to get the 40cm sprocket, the kit one may be too small.
I got my stuff at http://www.hometown-hobbies.com and my LHS You can also try http://www.greatmodels.com/. I always compare these two places best prices ive found.
Hope this helps
Joe

cheers, guys. You've been a great help.