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Discussion Starter #1
These two show up as compatible on the companies websites but they have different size threads. Also the Kats shows not compatible on retailer websites. The Zero start shows compatible on OReillys but not compatible on EBay and Amazon.

Kats 11479 24MM
Zero start 3100113 25MM

I also read the US Sonata engine block has some type of protrusion not allowing a block heater.
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