I don't think that's a standard nc30 part.

That bit sticking out the top of the rad is part of the rad Mark,

I've got one of those ballsack shaped things in my parts bin too, came with the bike, no idea where it's from but it must be a standard NC30 part if a few owners happen to have them.

http://www.400greybike.com/files/NC30.L ... Manual.pdf
page 94 part #30 maybe?

Nope they're the plastic cable clamps two different sizes.