I bought my one from Dinball ,Factory finished version,it uses the black sport tuned 540 and stock Tamiya ESC,the battery is a special short stumpy 7.2v Nicad [1700NP,part number 49171]and came with both sets of tyres,rubber for show and foams for running.
The start of the vid is on rubber[well thats my excuse]
I don`t think i can help you with any parts for yours ,with it being the original and very different under the skin,feEbay or a wanted add on Tamiyaclub might be your best chance.
I`ll have to get some better outdoor stills,the weekend is looking good.