Hey Guys....I just posted this over on the 997 forum, but I suspect the parts are the same for the 987 Boxster/Cayman.

Something interesting that I discovered while trying to find a replacement headlight control unit for my 997 headlight. You can use a Toyota part # 85967-08010 or 85967-50020. This should be direct replacement for 997.631.283.01 and 997.631.183.00. You can find these new for around $125 vs. $500 from Porsche. I bought a used one for $50 just to make sure it worked. I did a search here to see if anyone else had discovered this, but found nothing, so...here you go.

Here's the original Porsche part in the right headlight:


And here's the Toyota part mounted in the left unit: