Here are three less common insulators in clear glass as follows -- actual postage additional. (Note in the US I can usually fit 2 or 3 insulators in a regional flat rate box for $9 or less).

CD 677.7 FIDENZA // No 6186 (Italian T-bar) in VNM+ (Minty) condition -- $50 (SOLD)

CD 251 HEMINGRAY-61 // Made in U.S.A. / 7-8., VNM (tiny peck on the inner skirt) -- $8

CD 175 HEMINGRAY-25 / 0_4:: // MADE IN U.S.A. / 11, VNM (tiny peck and rub in the wire groove) -- $40