Found what I believe may be a suitable Track & wheels set, all though there are not enough wheels only 10 small 11mm diameter wheels in the set & 8 are needed per side.
the Tamiya # 70100 : Track & Wheels set :
* 2 x 30 link tracks 190mm long approx. (19mm wide)
* 4 x 10 link tracks 66mm long approx.
* 4 x 8 link tracks 57mm long approx.
* 2 x large drive sprockets 32mm dia.
* 2 x large idler wheels 32mm dia.
* 6 x large road wheels 22mm dia.
* 10 x small road wheels 11mm dia.
* 1 x drive shaft and 5 x 3mm standard shafts.
