Blue White Illustrated says that Michigan (and other teams) has reached out to Rice grad transfer DT Zach Abercrumbia (LINK). Abercrumbia is 6'2", 286 lbs. and made 55 tackles, 4.5 tackles for loss, and 6 quarterback hurries in 2018. He'll be a fifth year senior in 2019.
I have been somewhat critical of Michigan's DT play in 2018, so I'm glad Michigan is looking at options from the outside.