Joe…
I have an old brass one on my display shelf.
Just grabbed a dial caliper…
dia. => 2.336” -> 59.3 mm (60 mm?)
thick. => .044” -> 1.17 mm (1 mm?)
My stock wheels are in a storage unit, so I couldn’t test fit the emblem…
(Someone will correct me if this medallion isn’t sized for wheels…)
Ps. Car is looking good! Coming together!