99ENVA works with alternate versions of 3-up 1099 forms with no side perforation or with inserter equipment when side perforation is present. See specifications below for window positions. Order a sample to check compatibility. 

Specifications:
Size: 3 15/16" x 9 3/16"
Top Window Size: 1" x 3 5/16"
Top Window From Left Side: 9/16"
Top Window From Bottom: 2 5/16"
Bottom Window Size: 1 1/8" x 3 5/16"
Bottom Window From Left Side: 9/16"
Bottom Window From Bottom: 3/4"
Weight: 24#
Material: White Wove
Ink Color: Black
Flap Opening: Long
Seal: Moisture

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