273 HiPo air cleaner base inside diameter?

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Firstblood

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Ok, tired of searching, thought I would ask.
What is the i.d of an original base plate for this air cleaner.
I bought an air cleaner assembly that is supposed to be original.
The base plate I.D is 4 1/4"
The Carter afb on my car is not original and measures 5 1/8" across.
Help me out please.
 
I

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Just get one of the cheapie 9" chrome air cleaners and use the baseplate under the Commando lid with a 2-3" tall filter (depending on how much hood clearance you have).
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