New kit and declaring it to insurance providers

As many of you may know, I was unfortunate enough to bin my Monster a few weeks ago. The insurance company has ok'd the claim and the estimate, and those nice people at ProTwins are starting to get things together to do the repairs. I have agreed for a few upgrades to take place, chief amongst them a tail chop and fitting of Termis. I have a few questions on this:

1) Am I right in thinking that I will have to declare the changes to my insurance company as soon as I pick up the bike?

2) As Termis are considered Ducati's factory option provider, do they need to be declared or could it be taken that as the bike could have come out of the factory with them fitted I don't need to declare them?

3) Assuming both the tail tidy and Termis need to be declared, can I expect the insurance company to take account of my stack / claim when calculating my new excess or should this make no difference to the figure they're going to require that I pay?

Cheers!