Sir,
The bulb is a universal design used in many vehicles. Other vehicles do not have this second gasket, but have the bulb exposed in the rear.
However, you did not get any water in one year but it doesn't mean you will not. Maybe you drive through a puddle and get water in your light, or you pressure wash your engine or car and get it past the seal. I know alot of people lose those rubber caps or the rubber caps become brittle and crack.
So, I know I am not giving an unequivocal answer, but this is the best I have. Hope this was of value.
2013 XC70 T6, Premier Plus, BLIS Black/Black 18K miles, stock
2004 XC70 Premium, Convenience, Climate Blue/Tan 122K miles, 2007+ ABL lights, IPD sways F & R, TME exhaust, SS brake lines, R Brembo calipers & rotors, Akebono ceramic pads F & R (replaced PCV, power steering rack, struts and springs, end links, ball joints, A-arms, all fluids)
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