It's not really necessary to use parts from other vehicles: Corally makes their own line of upgrade parts, Team Corally (TC) 7075. They are high quality, and they are less expensive than many of the aftermarket parts for Arrma (i.e. M2C Racing). Here's a list of the TC upgrades I have installed on my Radix 6:
Team Corally (TC) 7075 T6 Tuning V2 front chassis brace (C-00180-387-2)
TC 7075 V2 rear chassis brace (C-00180-396-2)
TC 7075 suspension arm mounts (plate style) (C-00180-680, 681,682,683)
TC 7075 5mm front shock tower (C-00180-424)
TC 7075 5mm rear shock tower (C-00180-423)
TC 7075 XTR steering deck (C-00180-673)
TC 7075 PRO front upper suspension arm mount (C-00180-152)
TC composite 0 degree closed end suspension bushings (C-00180-048)
TC 7075 Ackerman plate (C-00180-704)
TC 7075 steering rack dual stiffener (C-00180-831)
TC 7075 center diff bulkhead (C-00180-832)