Is yours Bosch engine? Then, I think you mean rc11pypb4. The cheapest I've found for these plugs is at NAPA. They list it under #7070, but plugs themselves is marked rc11pypb4. If you guys don't have NAPA in Canada, then try online. I've found them for around $5.99.
new spark plugs look different
the ones in the engine now are almost new looking autolite app3924 double platinums, the ones I was given as replacement are bosch wr8dp, but it looks entirely different, even needs a different socket to remove it. The original is a rc11pydp4 but I cant find the crossreference numbers.
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