In this schematic the "Damper, Side Cover (437)" is used most often.
A sample from the products for the Couvercle Lateral include: Emblem 6, Cover, Side 3, Bolt(1wt), Bolt, With Washer (4n0).
The most reasonably priced component used on the Rd350lc 1986 1ua France 261ua-351f1 Couvercle Lateral is the Bolt, With Washer (4n0).