No longer available from Yamaha. Probably better than an NOS original as this one is not 35+ years old and brittle. 3rd pic shows flexibility.
Yamaha DT125LC Mk3 DT200LC Two Stroke Oil Tank Bottle #WG107
GENUINE YAMAHA CHAIN GUIDE - GUARD DTR DT125R DT125RE DT125X DT125LC MK3 OE NOS
Yamaha Dt125lc DT 125LC MK2 MK3 Chain Guide and Guard Genuine 34X Free UK P&P
Yamaha Dt125lc 1988 Mk1 Mk2 Mk3 Gear Box Internals
Pinion Shaft Bearing Transmission Yamaha DT125LC MK1-MK3 82-87 Sprocket Shaft Bearing
Yamaha DT125LC front or rear brake shoes (1982-1987) Y506 type, price for 1 pair