Hey Jay

The wire on the right looks like a bulb assembly as you surmised. Most of the 60s era fords used lamp bases with multiple metal "teeth" around the perimeter which "snap" into a hole in the housing. They use tension to retain the lamp base in place and therefore the "teeth are actually larger than the hole. You may need to take a small flat bladed screwdriver and work it under the lip of the lamp base then pry gently. As you apply pressure the "teeth" flex inward and allow the base to be extracted. Most of the bases were metal and should withstand some pressure from the screwdriver. Remember that these were designed to be removed for bulb replacement. another thing you could try is to twist the base while pulling. Remember to pull on the base and not the wire. Here is an e-bay pic of a typical socket with the retaining "teeth. Good Luck and I hope this helps

Keith/Bumble

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