Heavy Duty Idler and Drive gears?

[Cain]

Finally got around to starting my 1/5 savage flux conversion.

Anyway, I noticed when tearing everything down that the previous owner was using the light weight idler and drive gears and they were chipped. (not the dual gear one)

here are the stock parts I am referring to:

HPI86098 HPI Idler Gear 29T (1M)
HPI86084 HPI Drive Gear 32T (1M)

I figured i would look for some HD ones, but when searching tower and amain, I didn't see any.

Are there any heavy duty idler and driver gears made?