Suspension
Road wheels
Drive sprockets in the kit, the solid and perforated types.
Note oversized lightening holes
Image comparing the perforated sprockets.
Those with the correct sized holes (outlined) have inferior hub/rib detail
while those with the oversized holes have better defined inner hub/rib details.
The ideal solution would be to re-tool with the better hub/ribs and correct sized holes combined in the one sprocket.
Idler wheels with round and teardrop lightening holes
Return rollers
Bogie parts
Final drive parts