PanzerAce,
You may want to try the AAF museum PX they have the parts you need, probably be less by the time you factor in shipping and youwill likely get them faster since it is in the US.
Turret upper: http://shop.aaftankmuseum.com/Produc...ctCode=0335209
Turret lower "D" Sprue: http://shop.aaftankmuseum.com/Produc...ctCode=9003556this sprue also includes the rear lower hull plate and the turret front
Turret Ring sprue: http://shop.aaftankmuseum.com/Produc...ctCode=0115310
Here is the link to the manual showing all the parts you may need along with the parts listing with numbers. https://www.tamiyausa.com/pdf/manuals/56018ml.pdf
Steve