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Immigration applications are exempt from the rehabilitation act so it is irrelevant that they are spent they must be mentioned and should have been mentioned. You should mention under the criminal conviction section if there is a space to do so otherwise on the page with additional information.
EEA PR and Citizenship applications are separate applications and moving forward you should mention the facts on the basis of the questions you are being asked for this application. With regard to whether you should mention you didn't say before I cannot comment because you require legal advice for that I am afraid. JA prohibits experts from giving legal advice and also I cannot comment for your own best interest.
It is important that you do not make a mistake. Do it not say anywhere that JustAnswer cannot give legal advice?
Does JustAnswer advertise online to say you will receive legal advice?
Please send me a link which says JustAnswer gives legal advice
I will refer to JustAnswer about your concern but in the mean time when you fill out your forms you must mention the traffic offences you have.