https://media.ford.com/content/dam/fordmedia/North America/US/2019/04/04/1q-19-sales.pdf
Here's Ford's press release/Q1 numbers - Overall down 1.6% for the quarter - Ford down 2.1%, Lincoln up 11.2%
And here's March 2019 numbers:
I was able to figure out the discrepancies I was unsure of last month:
--PI-S and PI-U numbers are rolled in to Taurus and Explorer numbers on the monthly chart, while Ford breaks them out separately on their quarterly chart.