Help with pool lite replacement parts

Pool Equipment
1

Hi, I have an older 12 v pool light system.
Only discription is on the lens “Aperican Products Company Los Angeles California”.
Can you confirm which gasket I need, and recommend an LED color changing bulb. Current is small incandescent GE flood pool bulb 100w.

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2

Picture of bulb; Bulb measures 4 inches across its face.

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