Heisler Manifold for F-20

I am looking at 2 Heisler manifolds, both supposedly for an F-20. One has the number stamped on it HF 122, and the other has the number HF 122-L. Could anyone please tell me what the difference between them is supposed to be and are they both really made to fit on an F-20? The L version looks to have a little smaller exhaust manifold chamber on it if I am seeing it right, and the L has just a little smaller appearance, but I could be wrong about that. I sure would appreciate someone telling me what the differnce is if they would happen to know for sure. Thnx to any and all who respond.
 
HF-122L is definitely for an F-20. I can't find any listing for HF-122, suspect it may be an earlier design.
 
Thnx for the info Jim. It does look like either should work on an F-20, but I sure would like to know what the difference in numbers/letter was all about. I appreciate your reply....thnx again.
 

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