A big thing I remember about those European patterns not being approved by the DOT in the 80 is that they were not compatible with the quick aiming mechanism at inspection that they use to check the aiming real quick. DOT approved lights had those little glass nipples on them that allowed them to be aligned with the machine.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record