I have Phlogistan Spars, and have never seen any serial numbers on them. They are anodized and match drilled to the main bulk head (F-404 I think). There will be some empty holes where the bolts go through to attach spar to F-404 and also wing ribs. Go look at the drawings and see what you got before you panic.... there will be plenty of time to panic later in the building process. Good luck on the build, it is a long, but rewarding process. I am finishing up now.
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Mike
RV-4 #2750
N654ML
IO-360
WW150C Prop
1018 lbs
Flying
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