Ronmar
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that is not the p/n we are talking about. Take the 18 at the end and turn it into an 81... and the 81 is for a 44mm hole... 3500015 is the 1000w version, 81 is the 1500w version.Here is a listing from NAPA for the 3500018 Black heater. 50 mm hole. My block is 44mm much smaller.heater 3500018
Here is a listing for the 3500015 Block Heater 44mm in size.3500015 Listing
those are also pretty expensive, you can find them for $70-80 by googling 3500081...
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