If you are sending by mail:
Fees$120
Form I-765
Copy of I-485
Copy of past EAD (both the sides)
Top portion when they send you first EAD
Copy of I-94 (both the Sides, if you have)
Copy of I-140 (it is not must but many service center ask for it, VSC has renewed EAD with out copy of I-140 in past)
2 Photographs in separate small envelope (write your Name, DOB, and A # back side of photographs with pencil and attach that envelope with documents, on small envelope also write Photographs for EAD, name DOB and A #
Write in the cover letter FORM-I-765- RENEWAL OF EMPLOYEMENT AUTHORIZATION DOCUMENT your Name, DOB, and A # in bold and write what documents are attached.
Mark the main Postal envelope out side FORM-I-765 RENEWAL OF EMPLOEMENY AUTHORIZATION DOCUMENT (EAD)