I dont know why they dont have the vortex listing for parts up but here, i just searched all bumpers-

front vortex ss bumper- http://www.redcatracing.com/RC-Cars/62048
This one just says rear bumper for vortex, but they should be interchangeable on both nitro and electric- http://www.redcatracing.com/RC-Cars/62048_2

As for the shock towers/body mounts, im pretty sure the volcano bumpers will work, they are all plastic instead off those thin aluminum ones- http://www.redcatracing.com/RC-Cars/08012