whats all this for anywho?

My mistake. The aero heatsink part nunmber is H-1 for the Hot Wheels KIT Racers (Bit Racers).

These are just for my personal collection. I want all the rare accessories, to put on one car. That way it will be very difficult to duplicate. I just like collecting em'.

will anyone sell a 45 mhz chassis in good working condition

I'm not sure what our stock heatsink is made of. I thought it was just metal/tin but magnet dose not attract it