Here are two nice uniparts made by New Zealand Insulators - actual postage additional:

4 7/8 W X 4 5/8 H -- Incuse NZI on the ear - VNM -- $15

4 3/4 W X 4 3/4 H -- Incuse F / N.Z.I. / 55 on ear - VNM - very light scratching on back -- $18