What information do I need from the Samut Prakan Immigration office to convert an exemption stamp to a non-O spousal 90-day visa?

@AliJames ****

not for the initial 90 day extension. For the one year extension yes, plus the rest of the documents.

@AliJames ****

when done inside Thailand it is called an extension as you can not get a visa inside Thailand. Also you need to buy either a single entry, or a multi-entry re-entry permit to be able to leave the country, and come back on the same extension type. What you did before no longer exists so get all of that out of your head. You need bt400,000+ in your bank account. There are no longer any exceptions to this.

@AliJames ****

yes, but you were using the wrong terminology, and with visa and extensions it can avoid confusion. Of course you can get the 90 day type O inside Thailand, but you need the money in the bank here to do it. Then the only way to keep it if you leave Thailand and come back is by buying a re-entry permit.