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A series of Craftsman lawn mowers with Briggs & Stratton engines came with a Champion RJ2YXLE spark plug installed. But Champion never released RJ2YXLE to the market, and neither Sears nor Briggs & Stratton ever carried the plug as a replacement. Therefore, RJ2YXLE was essentially discontinued the moment it was manufactured.
Briggs & Stratton states B&S# 591868 is their replacement spark plug for Champion RJ2YXLE. The current aftermarket equivalent to B&S# 591868 is Champion RJ19LM (868).