All of them are just under the seat.

A


B

I think this is the diagnostic plug?

C

Hard to see but it looks like a 2 pin plug with a shorting cap on it.
Could it be for if you have to run on low grade fuel?

Thanks, Rich.

A Alarm/immobiliser seat contact plate

B Diagnostic

C Diode............

You're right. B is the diagnostic wire.

The others no idea, sorry

That was quick.