Hi Nate, You may want to consider this set of HL Panther G replacement wheels from rctank.de.
http://www.rctank.de/product_info.ph...roducts_id=733
This set has the replacement metal swing arms, bearings, and the rubber has the "Continental" embossed on it.
This set is correct in compared to the real thing. I have attached photos, from RC Tank Wars site, so you see what I mean.
I used a set for the Tamiya Panther G. Not this HL set, but they are the same wheels.
A little more expensive, but a better upgrade then just adding the metal MATO wheels to the plastic swing arms.
Here is a good resource of photos for the real Panther G at Bovington that may help you as well.
http://jtrowbridge5.smugmug.com/Panthersinmuseums/Panther-G-with-new-camouflage/13331662_LmQDsR#!p=1&n=10
Cheers, Rudy