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In my case I also bought from Melton Industries, they came in a zip lock baggie. They are 3/8" and ohmed pretty consistent. So far they have worked now for 7 months, pretty flawless, minus a 3 week period when it started hard and filled the garage with white smoke, pretty much anytime under 30 degrees F. Then I found the drivers side most forward wireplug came off the glowplug due to loseness. After I connected that connector, it started again within one second or less without any smoke. I was blown away that one plug disconnected made THAT BIG OF A DIFFERENCE. It's hard to overstate that one of 8 disconnected plug made that much smoke and hard star. It took probably 5-6 seconds of cranking before the engine would stutter and run really rough. After reconnecting that one, near flawless.... As to why your plugs are fried vs the cheapos, hard to tell...
Hope this helps.
