LS300 additional 7metre Antenna Cable extension & respective part code

This is for the US location OR.
I’m looking for an additional 7metre Antenna Cable for an existing LS300 modem in the Datacentre site. This required beacuse of local Signalling trouble in the site permysis. Hence, like to extend the cable outside of the cabinet.
Pelase confirm the correct cable extension i could use here, with its respectvie partcode details.