While reading THIS thread about LED bulbs I realized I don't know what bulbs are in my LX172. I went to check last night, but I cannot make out any indicators on the bulbs themselves to specify the type. Anyone know?
What I did to make sure what I had in my 300 was correct, I called the dealer up the street, and asked them what bulb replacement I need. They just gave me the number of the bulb, so like the fronts were #1156 and the rears were #194
Turned out, my head light bulbs were the wrong size that were in there when i got it. The rear ones, were too, as this was obvious, but I swapped the over to the correct ones soon after getting it, so I knew those were correct.
My head light bulbs were located in the web sites section of Tail Brake/Turn Bulbs and the tail light bulbs were in the Miniature Wedge Base Bulbs section if that helps.