Here we have for sale a CTC stainless steel rear shock absorber lower bolt
Yamaha part number 90101-08599. 
This fits all YamahaTY250 & 350 Mono bikes all years and models.
This rear shock absorber lower Bolt is no longer available from Yamaha, so we have had it re-manufactured to OE Specification using 316 Stainless Steel, so they will never go rusty again.
This is shown and replaces part numbers 8,9 & 11 on the rear shock absorber parts diagram.
We also have complete linkage Bush, Bearing, Seal and bolt kits available in our shop.