Hi Don. The vertical bar you are looking for is called an Enlarged Sign of Grouping in the Nemeth Code. You can find the enlarged single vertical bar listed in the table on page 123 of the 1972 codebook. Its use is illustrated in a determinant in example (2), Section 126, "Use of Enlarged Grouping Symbols".
Let me know if you have further questions. You have a big project ahead of you.