In the 1970s Lucas introduced the P36t 463. This was a 'half way house' between the British Pre-Focus bulbs and the later P45 & P43t. These had the British Pre-Focus fitting but with a H4 Halogen envelope in 12V 60/55W and the 3 spade push on connection.
Everything you say is correct. But, it's impossible to fix the 463-type in place with any socket on the market.
L.A.B. wrote:According to the parts books, the 463 bulb needs a Lucas 553738 adaptor, but that doesn't appear to have any means of retaining the bulb in the reflector, so I don't know exactly what held the 463 bulb in position.
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