Venice I Need spark plug cross reference please!

I have a 66cc Raw engine,that has a LD 28C plug....The weird thing is I bought 2 of these engine kits at the same time and one plug is much longer and bigger than the engine kit im running now.....What plug do I need to buy????
Thank you
John
 
Longer would be a BES NGK, the shorter is a BHS. So B6ES is what the longer one would be, which is 3/4 in. thread length.
 
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