I hope the attached pics are viewable .. . . Taken from my android phone. I am trying to contribute to the system. This is the most rare LRI I have. I call it a "barrel". There are no tabs and no tabs missing. The top and bottom are symmetrical, only one end is an under pour harelip and has a chip. I got it on eBay with a couple of other insulators last year.
DIMINSIONS: Height = 2 1/8" Top and bottom, OD = 1.25" Center OD = 1" Id = =/- 5/8 "