I have an older (1985 GMC Vandurra) conversion that used this type of bulb in the headlights. Unfortunately, store-bought replacement bulbs had an extended lip that prevented full seating. I figured I'd take a chance because I needed the camouflage that red light would provide. It turns out they also have a pronounced rim that causes the same problem as replacement bulbs. Solution: The 60 grit sandpaper lip has been reduced and now works like a charm.
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