I have decided to order 4 Rizoma Track 77 indicators for my '06 Speedie. I was at Jack Lilley's so I picked up the LED compatible relay but I'm not such what the rest of the gubbins in the boxes for.

I had hoped that it would be a case of removing the relay that clicked when you put the indicators on and putting the new one in. What are the rest of the wires and connectors for and the rubber whatsit?
When I get the indicators will the connectors be plug and play?
Is it best to remove the OE lenses and pull the wires through to remove them?
Any tips would be gratefully received.