briggs 725 easy start

Hi was wondering i have a craftsman with briggs 725 platinum engine and i have been reading that people have been having a hard time starting the mower and the plug is getting fouled. the original plug RJ2YLE has been replaced by RJ19LMC Which is not a common plug and hard to get without ordering it.Some people have put the old briggs plug in RJ19LM and have started with no problem and ran great.If this is correct the gap is .020 for this mower when they put the old plug did they gap it at .020 of leave it at .030.Thanks for the help