That’s correct, you should be good with just the SEM. The existing communicator would need to be removed. Here is a similar thread regarding that type of panel.
Yes, those would be the basic steps, though a Prom upgrade is usually not required unless too old.
Disconnect the Pulse cellular/broadband communication devices before installation of the SEM.
I cannot vouch for any specific third party seller, though Vista is a popular panel and a number of vendors online offer parts.
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