I've been building my Hilux 58028 for about 3-4 years and finally got it running!
Still needs original axles so I'm using Rc4wd Brusier edition axles and leafs for flex.
Otherwise I'll say E-bay is where you find the parts, you may find parts
at recyle RC or something like it...
http://www.rc-recycler.com
Good luck
Badboy