They will work without any modification, you can just straight swap them like a regular headlight. The wiring harness will only cause the low beam to swivel up into the high beam, but is not required for the high beams to function. You cannot add the self leveling feature, that was only available if it was ordered with Litronics from the factory.
Not sure about the second question.
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1999 Ocean Blue Metallic Boxster - blueboxster.com
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