I note I am holding in the clutch so there must be a car or another bike ahead of me .
One of the problems with buying old spare parts online and hence unseen apart from a picture is that you find stuff that has not been well cared for. Some items I have purchased looked like they had been dredged from the bottom of the sea having been there for decades.
Often you are so desparate for a part you will spend the time salvaging it to be workable again.
An engine is made up of 'big lumps' and all the fasteners and nuts and bolts which hold it all together.
A pet hate is when someone sells you something and does not include the fasteners. Old motorcycles use a huge range of types of thread and it can be difficult to get hold of the correct ones...or even identifying what type they should be.