I think the coaxial cable (long) grommets are to protect the cable where it goes through a metal plate (e.g. vehicle bulkhead or roof).
The No.23 grommet has a much smaller hole and is most likely for the wire aerial feeder (No.9?) on the truck and ground station. It looks about right for P11 cable between the aerial base on the vehicle and the rigid aerial base on the Carrier No.3 mounted set.
Chris.
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