How do I send required FY2017 K-1's to estate beneficiaries when there are no 2017 K-1 forms available from IRS?

I have filed 1041 income tax for an estate with fiscal year 2017 ending Jan 31, 2017. The return was due and filed May 15, 2017. IRS rules say I had to send 2017 K-1’s to beneficiaries prior to filing, but as of June 2017, the 2017 K-1 forms are still not available on irs.gov. Since the beneficiaries are family members, they are unlikely to be mad at me and don’t need the forms until early 2018; however, I would rather have obeyed the law, not to mention get it done so I don’t forget. I suppose I could use a 2016 form, crossing out the “2016” and printing “2017,” but that could confuse them and their accountants, who have already filed their 2016 returns. What am I supposed to do?