During the restoration of my 350GTR I looked for an alternative for various parts and I would like to share my experiences.
Most parts are for the 350, but many like bolts can also be used for other Bridgestones.
Nut crankshaft m20x1 L.H. screw thread 09029-104 Sachs K125 front sprocket nut ( ritzelmutter)
Oil seal clutch cover 47x60x7 Honda 91251-361-005
Oil seal clutch 09090-124 Suzuki 09283-22018
Handlebar Lucas/TRW MCL112SS
Grease nippel Kickstarter Suzuki 08351-11009
C ring kickstarter 09004-102 Yamaha 99001-12600
Bolt kickstarter 2687-9000 Suzuki 09135-10002
Hex nut M8 wrench size 14 mm. Honda 94030-08000
Hex bolt M8 wrench size 14mm: Lenght 10mm. Honda 92101-080100a 12mm. 92101-080120a 25mm 95201-0802500 35mm. 92025-08036 40mm.90101-08244 125mm.( chrome) 90112-001-000 170mm.90130-051-740
Hex bolt m6 chrome 6x10 Honda 92101-060100b 6x12 92101-060120b 6x16 92000-060160b 6x28 92200-0602802
Chrome nut m6 Honda94001060200s
I hope this will help you search for genuine parts, Ernie