[YogiBear]

So, as a complete n00b to this, how exactly does one go about looking for replacements? Do you walk into an auto parts store and ask for the model(s) listed in the OP, or do the models change with bulb make? What are some good, commonly-available brands?

In particular, I would really like to find a higher wattage (brighter) replacement for my GC's high beams. They don't seem very good at all, especially on these really dark winter nights.

Bulb sizes are the same regardless of the company - the only thing they might do is add suffix letters like if you had a bulb that was 921 in size ... you might find 921ST where the ST is some tweak that particular bulb has from whatever the company is (specifically I think ST means Silverstar if I remember right). If you go to a local auto part store they will not have much of anything better than Sylvania Silverstars which are not half bad but they are halogen - they have been good to me for years. They have very bright white light and I had a set of Silverstar headlights last over 5 years in my truck that I drove daily. If you want LED bulbs the best you will likely find at one of those stores as far as brand is APC. You can find better LEDs from sites online but I would first look at vids of how other cars with the same model bulbs work and how the bulbs look - there are many videos out there. Diode Dynamics is having a sale on the 27th for one day and the prices are good, but, as I said try to find some video examples of the exact types/styles you're thinking of buying.