The amp draw increase between 37w & 42w is less than .5 I have upgraded the back-up lamps on every vehicle I have owned from the stock 27w to 50w and have never had a problem. If you want to know for sure how much higher wattage you can go for any of the lights you have mentioned just look to see what amp rating the fuse is for that circuit. I'll bet you find that you can safely double the wattage of any of the lights and still be well below the amp rating of the fuse. I currently have 80/100w bulbs in my Bonneville, stock was55/60w
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