These two show up as compatible on the companies websites but they have different size threads. Also the Kats shows compatible on one retailer website but not compatible on Amazon. 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. Is this true?
Both companies shows plug is located center back (towards dash) on engine block. Is this plug only accessed from underneath? Would anything have to be removed to get to it?