2243 is the equivalent of the old Auto-lite AR5s, which is the cold plug. If you have an oil control problem, or the plugs foul up, then 2245 (AR7s) is the plug to use.
There are also the Champion XMJ14 and XMJ17 which are interchangeable. The Champions now use a new number which I don't know off the top of my head but is easy enough to find.
My information is that Autolite is no longer making the 2245, and may have also dropped the 2243, so it is going to get a little harder (and expensive) to get plugs in the future. I can still get 2243 plugs at under $13 a plug. The Champions are up around $28 a plug with a trade price of arouns $18.
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