According to the 4852 instructions from the IRS, you need to contact the IRS first. "If you don’t receive the missing or corrected form from your employer or payer by the end of February, you may call the IRS at 800-829-1040 for assistance. You must provide your name, address (including ZIP code), phone number, social security number, and dates of employment. You must also provide your employer’s or payer’s name, address (including ZIP code), and phone number. The IRS will contact your employer or payer and request the missing form. The IRS will also send you a Form 4852. If you don’t receive the missing form in sufficient time to file your income tax return timely, you may use the Form 4852 that the IRS sent you to file with your return.
I would contact the IRS first instead of filing out the information on your own.
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