you would just get 8453 from the IRS website and fill it in, it's just a cover sheet. you need to mail the details of the wash sales, the instructions say to send form 8949 or 'statement with the same information' - that's not usually the same 8949 with summary info that you filed as that's already been sent electronically, it's supposed to the details of the sales with adjustments - people usually send the 1099-B.
