Team VTX was a spinoff created by RC company GS Racing. It might be worth contacting them directly to see if they know of any stock...
http://www.gsracing.com.tw/
for what its worth, the VTX ST-1 shared most of its parts with the GS Racing CL-1 buggy, however, I doubt the chassis plate is one of those common parts, since truggies usually have longer chassis than buggies, yo9u never know though, it may be the same chassis.