Front linkage pivot to frame:
BEARING: 17x24x15mm (full complement caged drawn outer cup needle roller bearing) Yamaha part number: 93315-31758
I've found wemoto the cheapest for this type of bearing. Branded bearings like SKF, KOYO, FAG and IKO are available too from places like
simplybearings.co.uk, but suprisingly aren't actually that much cheaper than OE.
Wemoto:
http://www.wemoto.com/parts/picture/al-40-3030/
OE:
https://www.yamahamotorcyclespares.co.uk/product/YAMAHA/933153175800/BEARING&uid=0 (or obviously from your dealer)
SEALS: 17x24x3mm Yamaha part number: 93109-17071
Wemoto:
http://www.wemoto.com/parts/picture/YH-93109-17071-00/
OE:
https://www.yamahamotorcyclespares.co.uk/product/YAMAHA/931091707100/OIL%20SEAL&uid=0