1)There is 3 bolts retaining the headlamp assembly.
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2)The 37W that you are talking about are use for the foglight, and when you use 50W you might have melting problem. The low beam is, if i remember correctly 55W and the high beams are 65W.
100W looks pretty high. Do a little search and you might find answer for this question about the highest wattage that you can use in your low and high beam.
Nic.
