4506-t "request for transcript of tax reture" for i-864

请问，当我在填IRS表4506-t“request for Tax return transcript"时，我需要check box 6a:return transcript,我还需要check box 8 “Form W-2, form 1099 series, form 1098 series or form 5498 serires transcript"吗？谢谢。