anyone know if this is the left side crankshaft seal (i need technical name. imma a newb in the dirt bike world.) for my 1990 rt180? part # 358439-001. its what a yamaha tech said i need and he aint got no pic or or part in stock to show me. and should i just go ahead and overhaul the seals since its been sittin for 3 yrs, while i have it apart?

easy way to find out for you in the states go here all yam parts list parts lists clck here

but that lists a different number so it may have been a superseded part if you go too bike bandit they have it listedand you can order it from them bikebandit rt180