8. As suggested by Kane at Evilution guide you can reheat old rubber and snap your headlights together, but I decided use new seal to make sure that my light will not fog or leak.
I got rubber butyl / OEM sealer from my local Nissan dealer. Part number B6553-89915. You can also buy it online:
BuyNissanParts.com
search for B6553-89915 and a list should come up. It's the last one on the list.
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This is EXACTLY what smart using for they seal. To install new seal you will need to clean your headlight from old seal as much as you can. Be carefull to use GooGone or any similar products on your clear plastic, there is a chance that you might damage it. You will only need to use about 3/4 of the roll for both headlights. Do not put to much of the sealer or you might have a problem to snap two halves together. Preheat seal before you do that.
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9. Install your new headlights.
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If you have any questions, please feel free to ask.
CUBE
I got rubber butyl / OEM sealer from my local Nissan dealer. Part number B6553-89915. You can also buy it online:
BuyNissanParts.com
search for B6553-89915 and a list should come up. It's the last one on the list.

.
This is EXACTLY what smart using for they seal. To install new seal you will need to clean your headlight from old seal as much as you can. Be carefull to use GooGone or any similar products on your clear plastic, there is a chance that you might damage it. You will only need to use about 3/4 of the roll for both headlights. Do not put to much of the sealer or you might have a problem to snap two halves together. Preheat seal before you do that.

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9. Install your new headlights.

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.

.
If you have any questions, please feel free to ask.
CUBE