Actually #1 in
this link is the valley pan, but you need to remove the crossmember and pipes in that picture to get to it anyways. So you would need the #5 and #7 o-rings as well as the #2 gaskets to do the job anyways. And you would need the intake manifold gaskets as you need to pull the manifold for that as well.
The involvement of this job is why I usually make this the time to change all the crankcase ventilation hoses, intake manifold gaskets, rear cover of the manifold which houses the rubber diaphragm for the crankcase ventilation system, etc.