Keith,
There is enough room, but to set your mind at ease, remove one of the pancake fixtures and put a tape in the about inch round hole.
Yes, they take the bi-pin type LEDs.
The 4" pucks need about an inch and 5/8'ths depth and take the G4 15 LED. The smaller, 3" pucks need an inch and a quarter depth and take the G4 12 LED.
We love them!
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