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No idea if the military ones are silicone or not, I just noticed McMaster said their high-temp silicone ones are red and the military ones are also red.
I updated my original post. The 46.5 is from marking the ring with a sharpie and measuring how long it was going around, it gives about a 15" circumference. From looking on McMaster it looks like they might be dash number 384 high temp silicone orings.
3/16 diameter, about 46.5 inches long. I used them when I put my uneven pattern 24 bolt wheels together and they are working great, no leaks and its been months.
http://www.hummerpartsguy.com/O-RING-WHEEL-RED-1650-RIM_p_639.html
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