Gorehound:

The parts ID numbers are right in the manuals. Each sprue & bag has an ID number. If you don't have the relevant manual, you can find most of them on the MAADHQ site in the MAAD-Labs section: http://maadhq.com/html/maad_labs.html

The KT wheels may be expensive, it requires 6 styrene sprues, plus the metal roadwheel-rims, a bag of screws, and the bushings & shafts. For prices, I used www.TamiyaUSA.com, and input the reference numbers.

9415937 (Wheel Bushing bag : MF1-3)
9415939 (Shaft Bag : MS1-4)
0005923 (Sprue A : 6 required)
9405055 (Roadwheels : 36 per bag)
9465805 (Screw Bag D)

And perhaps the idlers: 9805218 (Idler parts A-C)

But a tip on buying: Karen at the AAF Tank Museum can offer significant discounts over the listed MSRP (Manufacturer Suggested Retail Price) that Tamiya lists. You can contact her through the AAF PX: http://www.aaftankmuseum.com/RC%20PX.htm or directly through her e-mail: [email protected]