This forum is pretty focused on GG enduro bikes, so I'll try my best with the trials info!
I bought my shorty clutch lever from:
http://www.lewisportusa.com/parts_bars_levers.htm
I don't see why the handguards would be trials specific, so a cheap set from any mx parts retailer should work just fine. Here are some cheap options:
https://www.rockymountainatvmc.com/t...ndguards?b=294