Originally Posted by snobdrak
Actually I don't think either require sanding, if you get them put on in just the right position. I found this out by accident. I put the new bulb on the plastic base to see how they fit together, saw that they needed to be shaved by a little bit and went to get a file. Before I started filing, I put them on the base one more time to make sure I knew what/where I was sanding and the bulb rotated right into position. When I went to do the second bulb, it looked again like it was going to need sanding, so on a hunch I took the bulb off and rotated it 180 degrees, and put it back on the base and it slid right into place. For reference, the bulbs I was using were the Amber WeissLicht bulbs.
It looks like the tolerances on these LED bulbs varies just enough to cause problems.