help with injectors

[ALKY]

My diesel tractor needs injectors,can I just remove the old and put in new or do they need set? any help will be appreciated.:confused2:

 

[Willl]

Usually just a drop in.

Can't get the old ones rebuilt ?

 

[ALKY]

My dealer says they are only 12 bucks,6 for rebuild so I might do both.:thumbsup: