How to replace a 1769-SDN with 1769-ARM

I have an older project with a 1769-L35E controller with three local I/O modules.
I want to remove the 1769-SDN module in slot 1 and replace it with a 1769-ARM.
Seems simple enough. I do not find the 1769-ARM module anywhere in the (alphabetical) list of modules.
I am aware that I could delete the SDN module and re-address the other two modules (and might have to do that).
What am I missing?
Thanks in advance for your help.

Best of my knowledge, You just inhibit the module you are physically removing in the program and then put the -arm in its physical place. I don't believe you add the -arm in the program at all.

See this answer in the knowledgebase
https://rockwellautomation.custhelp.com/app/answers/detail/a_id/43811