1973.5 911 T Correct Case Perimeter Nuts

After having Shaun at Tru6 plate about everything possible and having it all come back looking amazing like jewelry, the case replacement perimeter nyloc nuts I ordered from Pelican now look very deficient - they almost look chrome. What is the correct finish for perimeter nuts on a 73 911 T? I ordered belmetric yellow zinc nyloc nuts, but want to do whatever is more correct. What was the original finish? Hoping you say yellow cad / zinc because almost everything else is and I like the look. My originals were too corroded to tell. thanks

Originals are yellow zinc with blue nylon inserts.