Primary gear inner bush (block end) for 1275 cc engines.
This metal backed bronze bush suits most gears (there have been some odd size gears) and when fitted also needs to be machined to suit crank diameter plus clearance.
TIP: measure crank diameter before building engine as hard to measure when bellhousing is fitted.
Very common to recondition primary gear by fitting 2 new bushes and then machining ... improves driveability and oil leak resistance.
We also have a fully floating bush.
