Anyone else have experience with these Sylvania Silverstar headlights? They seem to only last about 8-10k miles. I first bought last spring 2 of them for my '86 C10. Great lights, noticably brighter. But in late summer, left burnt out, replaced it, shortly after, right burnt out. Now, my left just burnt out again. At $18/piece, I think I'm going to get the Hella route, the clear lens with the replacable bulbs.