A LONG time ago, John Muir (correct?) wrote in the idiots'
quide to the beetle (?) that the threads on Bosch plugs were
more likely to match those in VW cylinder heads than those
of any other spark plug.  I believed it then, but in any
event 5 vehicles at my house (2-2cyl boxers, 1-boxer 4,
1-inline 4, 1-V8) have 20 Bosch plugs installed.  If I could
find 'em, so would the string trimmer, chipper/shredder, and
mower.  Bosch invented electricity and fuel injection, no?