injection housing leak

[aafc]

After a hard drive i noticed some oil on the right side of inj housing. It looks like there is a leak from the gasket. Time to pull housing and replace the
gaskets. Should i replace the o rings on my injectors while i'am in there.
Injectors are from FIC installed some time ago. I ordered new housing
gaskets and plenum gaskets, but forgot to order o rings. Do i replace
only the primary or do all of them.
Thanks
John