ORIGINAL: Panther G
Are you sure it is a Tamiya ? Before you go crazy looking for parts. Hulls and turrets are very close between HL and Tamiya.
I can't find the Tamiya logo inside it or outside it. But all the fittings, screws, mounts and everything else I compared with, is just like what the tamiya manual (pdf-file) say. If there is a hidden sign somewhere I can look for, something different between HLand tamiya?
EDIT!
Found the proof. Inside the comanders hatch. It's a Tamiya!