The PA kits do not work properly with the dual-chamber pods, travel is limited and the flaps will not fully close.
Click here for a recent post with more details.
Yes, the internals of #30 can be used to repair #29.
I would be surprised if Pelican can supply center pod #02, which has been NLA for years. The PA diaphragm (ACD 2010) will repair this pod correctly. If Pelican had one left, it was probably the last one anywhere. It's showing NLA on their site now (
link).