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well to say at least... allmost all 6 cylinder motor has the B1 which Aaron I. stated which is the new part number
trucks are the only exception of having this B1 filter on the four cylinder truck motors and the Previa has this filet too

while the A2 (cant remember the numbers) is a smaller filer for the 4 cylinders like the S engines, A series and other small four cylinders on the Toyota clan of cars

exceptions to the A2 filet is the four cylinder ZZ engines that still has the same diameter filter but has a longer filter due to bigger needs of oiling filtration which designates to a A1 fliter

and Bob... all M series motors and even V6 Toyota motors a re interchangeable filter even with the JZ engines :wink:
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