i havent seen any new covers you can buy yet anywhere, i seen one made that looked pretty good by a guy here that would be your best bet, if you have a jig saw and some time you could make one out of some thin sheet metal or aluminum, you would wanna make it as one piece meaning on one end you would leave a small sqaure tab sticking off boths side to come back with a sanding wheel on a dremel to round the tabs into pegs to work as the hinge, lum would be better for this because you could squeeze it enuff that it bowes enuff to get the pegs in the ring of the fast traxx chassis
thats my take on it