Guide T-3 bulbs were used exclusively on GM cars because GM owns Guide! I don't believe any independent used Guide bulbs, and I was around all the independents most of my life. There are many GM hobby suppliers selling the 12V T-3s because they have been remanufactured. Have not had to look for 6V T-3s though so not sure if those also have been made but I would not be surprised. Wayne Graefen
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