Projector headlights vs Reflector headlights

I have a nimbus grey 197 with the chrome reflector headlights but I have recently bought some secondhand mk3 black projector headlights simply because I think they will look better!

When I've got them home to inspect them, it looks as though the projector headlights have 2 extra bulbs in them compared to mine, I think mine has 4 these have 6. Now I have read that one is a turning light which won't work anyway but can someone explain what the extra one is and also explain which bulbs (H7, 501, Halogen, Xenon, HID) I need, as I'm not sure what half of it is.

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Hi

I also wanted to convert mine to the projector ones, is it plug'n play? Does the electric regulation still works? Thanks