@Vern ******
you applied for a 90 day Non-O visa and now when you have 45 days or less left on that new 90 day entry stamp you can go apply for the year extension. You will need ALL the same documents you used for the application for the Non-O visa (in section C-1) to apply for the year extension.
You WILL need a new bank letter, and to update your bank book on the date you apply for the year extension so it shows the balance on that date AND the money needs to be in the bank for 2 months before you apply for the year extension.
When you were out there getting the Non-O visa and 90 day stamp inked into your passport in section C-1 you should have went over to section L and gotten the hand out listing the required documents needed for the year extension :(