Just pulled the original off my Arlington and it was plain .. only a 56K mile car too. Thread on it in the 68 forum ... seems random with/without. I went ahead and saved the $20 and replaced it with another no-stamp.
If you still have the original and the cup seal is good (between MC and booster), consider using the old one, the reproduction boosters use a different type (at least mine did) that doesn't seal the gap between the MC and booster ... it's just a rubber washer that goes down in the booster cavity. The OEM piece seems much more robust.
If you want really correct ... bear in mind they are date coded and have application codes in some cases.
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Last edited by dataway; 01-21-2022 at 04:34 PM.
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