All of TR's pillars come as standard with undercut or non standard without undercut. The advantages of undercut are that there is no need for washers in assembly and they offer a flush fit. This data sheet details the range of materials and sizes the spacers and pillars are available in.
State of emergency declared after Baltimore bridge collapse
The Dali has (had?) a beam https://en.wikipedia.org/wiki/Beam_(nautical) of 48m https://www.vesselfinder.com/vessels/details/9697428 They were presumably <i><b>intending</b></i> to navigate under the...