I went ahead and changed both bulbs to the after market bulbs from the parts houses. My concern was that the ones I took out said 45 watt and the replacements are 55-60 watt. I think they will only pull about 2.5 more amps. This must not be a problem since it sounds like most people are using them.
Jeff, I've put 2 130/90 watt H-4 bulbs in my 1500 and have had no problems, but they are a lot brighter. And they are all-weather bulbs, with a yellow tint that works very well in the wet., and might be more noticable to other traffic.