Vartiak, the rollers go on the outside top and bottom of the chain and they pull the chain together to keep tension on it. You will need some flat washers to space the arms out away from the frame to get the roller wheels where you want to ride on the chain. It's not that complex of a system. I don't know if I have pics of one with a chain on any of my trikes, I'll check though.
Nicholson 500x (Project)
Nicholson 185s
Nicholson 110 (That takes an atc70 tank)
Ascott 500 head/350x (Project)
Homebuilt Racer Chromoly Suspension 110 (Ragin Runt)
PK Racing Suspension 70
A+ Inc Suspension 70
AWS Aluminum 90 frame
Hi Performance ATC Suspension frame rd350
Hi Performance ATC Suspension frame 90