Rj19lm
It crosses to a champion RJ19LM
Rj19lm
Champion spark plug RJ19LM is for lawn mowers or similar equipment. The standard gap is .030 inches or 0.76mm.
Resistor
Rj19lm
yes
If you damaged a Champion RJ19HX spark plug, then you can indeed replace and substitute that with a Champion RJ19LM spark plug due to the similarity in their sizes.
yes
Champion RJ19LM will work.
RJ19LM Champion
about an 1.8 inch is close enough