need to get the black widow TRX-1 ready for a vintage meet end-May

I've always ran her in the grassy yard without a transmission cover... but that time it'll be on a dusty/rocky old-school track, hence the need to equip her fragile teeth with a cover to not chew up a spur right away.
Given how many times the TRX-1 transmission componentry has been used across the Traxxas range, there MUST be an easily available, almost-drop-in transmission cover that fits, right? And someone here MUST know about it

Thanks in advance for the help

Paul